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anonymous

  • one year ago

help area of shaded region

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  1. anonymous
    • one year ago
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    @

  2. geerky42
    • one year ago
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    Can you find area of semicircle?

  3. geerky42
    • one year ago
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    Semicircle is just half the circle. So it's like finding area of circle, but THEN you divide it by 2.

  4. anonymous
    • one year ago
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    yes that 4.71cm2

  5. anonymous
    • one year ago
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    @geerky42

  6. anonymous
    • one year ago
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    was that right @geerky42 ?

  7. anonymous
    • one year ago
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    @Michele_Laino

  8. geerky42
    • one year ago
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    No.

  9. geerky42
    • one year ago
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    Area of circle is \(A = \pi r^2\) So to find area of semicircle, you just use this formula then divide by 2.

  10. anonymous
    • one year ago
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    but you said semi circle so wouldn't it be A=1/2pi r

  11. geerky42
    • one year ago
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    My point is, to find semicircle, you just find area of circle, then divide by 2. Get it? Also it's \(\pi r^2\), not just \(\pi r\).

  12. geerky42
    • one year ago
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    So area of semicircle is \(\dfrac{\pi r^2}{2}\)

  13. anonymous
    • one year ago
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    @geerky42 so 9.42cm2/2=4.71cm2

  14. geerky42
    • one year ago
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    Radius is 3, so you have \(\dfrac{\pi(3)^2}{2} = \dfrac{9\pi}{2}\approx 14.137\)

  15. geerky42
    • one year ago
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    Just remember that \(\pi\approx3.14\)

  16. anonymous
    • one year ago
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    yes you told me that, thats how remember what pi is but how did you get the 9pi over 2

  17. geerky42
    • one year ago
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    \(3^2 = 9\)

  18. geerky42
    • one year ago
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    you divide 2 because semicircle

  19. geerky42
    • one year ago
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    Is that clear?

  20. anonymous
    • one year ago
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    yes kinda

  21. anonymous
    • one year ago
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    thank you though @geerky42

  22. geerky42
    • one year ago
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    Well, we are not done

  23. geerky42
    • one year ago
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    we got area of semicircle. Now we need to subtract that by area of triangle

  24. geerky42
    • one year ago
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    (Area of semicircle) - (Area of triangle) Right?

  25. anonymous
    • one year ago
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    yea

  26. geerky42
    • one year ago
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    Ok. Area of triangle is \(\dfrac{1}{2}bh\) Do you know base and height here?

  27. anonymous
    • one year ago
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    but we don't have the area of the triangle so we need to solve for the triangle

  28. geerky42
    • one year ago
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    Right.

  29. anonymous
    • one year ago
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    so 3 would be our height

  30. anonymous
    • one year ago
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    so how would you find the base given only the height

  31. geerky42
    • one year ago
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    We don't really have to use height to find base. Triangle and semicircle share same base, right?

  32. anonymous
    • one year ago
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    yes

  33. anonymous
    • one year ago
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    do the MAGIC! drawing thing geerky

  34. geerky42
    • one year ago
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    We know that radius of semicircle is 3, so what is diameter?

  35. anonymous
    • one year ago
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    :D

  36. anonymous
    • one year ago
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    hahaaaa @camacho01erick that was the best response

  37. geerky42
    • one year ago
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    lol. though I don't see the need to drawing something here lol.

  38. anonymous
    • one year ago
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    1.5

  39. geerky42
    • one year ago
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    maybe I will do magic thing once asker solve something like gif of victory lol.

  40. geerky42
    • one year ago
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    @Mromanos96 No \(d = 2r\), right?

  41. anonymous
    • one year ago
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    k

  42. anonymous
    • one year ago
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    yes

  43. anonymous
    • one year ago
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    6

  44. geerky42
    • one year ago
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    |dw:1433962650107:dw|

  45. anonymous
    • one year ago
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    :0

  46. geerky42
    • one year ago
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    Yeah so diameter is 6. Therefore base of triangle is 6. MAke sense so far?

  47. anonymous
    • one year ago
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    yes so next we have 1/2 6*3

  48. geerky42
    • one year ago
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    |dw:1433962764011:dw|

  49. geerky42
    • one year ago
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    Sorry yesh that's correct.

  50. anonymous
    • one year ago
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    lol funny ones

  51. geerky42
    • one year ago
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    just laughing at ":0"

  52. anonymous
    • one year ago
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    so thats 3/64 @geerky42 great gif btw

  53. anonymous
    • one year ago
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    that kinda scares me

  54. anonymous
    • one year ago
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    @camacho01erick it kinda does if you look at it for a little

  55. anonymous
    • one year ago
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    ikr

  56. geerky42
    • one year ago
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    |dw:1433962900186:dw|

  57. anonymous
    • one year ago
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    how do you do that :D

  58. anonymous
    • one year ago
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    :0 my favorite show man

  59. anonymous
    • one year ago
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    @camacho01erick he's a wizard

  60. anonymous
    • one year ago
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    fa fa fabulas

  61. geerky42
    • one year ago
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    Anyway, no I got 9 for area of triangle

  62. geerky42
    • one year ago
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    \(\dfrac{1}{2}*3*6 = 3*3 = 9\)

  63. geerky42
    • one year ago
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    Right? @Mromanos96

  64. anonymous
    • one year ago
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    how didi you do the gif @geerky42

  65. anonymous
    • one year ago
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    ah how did you get that the only other one i got is a decimal

  66. geerky42
    • one year ago
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    For area of triangle?

  67. geerky42
    • one year ago
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    Did you use calculator?

  68. geerky42
    • one year ago
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    I guess I need to make tutorial @camacho01erick in LaTeX section. I will tag you someday, I promise.

  69. anonymous
    • one year ago
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    kk

  70. anonymous
    • one year ago
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    yea

  71. anonymous
    • one year ago
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    good thing i fanned you @geerky42

  72. geerky42
    • one year ago
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    Well, put that in calculator 1/2 * 3 * 6

  73. geerky42
    • one year ago
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    You should get 9, right?

  74. geerky42
    • one year ago
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    lol @camacho01erick

  75. anonymous
    • one year ago
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    yup

  76. anonymous
    • one year ago
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    |dw:1433963336155:dw|

  77. anonymous
    • one year ago
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    so 9cm^2

  78. geerky42
    • one year ago
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    OK. Now do final thing; (Area of semicircle) - (Area of triangle)

  79. geerky42
    • one year ago
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    We have \(14.137 - 9\)

  80. anonymous
    • one year ago
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    we are /\tlas we will follow and we will not forget and will not forgive

  81. anonymous
    • one year ago
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    5.137

  82. geerky42
    • one year ago
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    Yep. Sorry first area should be \(14.13\) since we have to use \(3.14\) for pi. But anyways your final answer is \(\boxed{5.13~\text{cm}^2}\)

  83. geerky42
    • one year ago
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    Is that clear so far?

  84. anonymous
    • one year ago
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    yes crystal

  85. geerky42
    • one year ago
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    ok good.

  86. anonymous
    • one year ago
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    @geerky42 one last question

  87. geerky42
    • one year ago
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    https://www.mathsisfun.com/data/relative-frequency.html

  88. geerky42
    • one year ago
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    And here, voting registration status is irrelevant.

  89. geerky42
    • one year ago
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    So we just need to find how many adult prefer newspapers Then divide it by 252 (total)

  90. geerky42
    • one year ago
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    Follow me so far?

  91. anonymous
    • one year ago
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    yes

  92. geerky42
    • one year ago
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    OK. how nay adults prefer newspaper?

  93. geerky42
    • one year ago
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    how many*

  94. anonymous
    • one year ago
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    46+24=70

  95. anonymous
    • one year ago
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    hi

  96. anonymous
    • one year ago
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    70 /252= 0.2

  97. geerky42
    • one year ago
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    Correct. So relative frequency is \(\dfrac{70}{252}=?\)

  98. geerky42
    • one year ago
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    yeah but close. question said at least two decimal places.

  99. geerky42
    • one year ago
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    So we have 70/252 = 2.777777777... So round that to .28

  100. anonymous
    • one year ago
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    0.27

  101. geerky42
    • one year ago
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    That's your answer.

  102. anonymous
    • one year ago
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    so it .28 not 0.28

  103. anonymous
    • one year ago
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    |dw:1433964202516:dw|

  104. geerky42
    • one year ago
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    Well it is closer to .28 than .27

  105. geerky42
    • one year ago
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    0.28 and .28 are same

  106. anonymous
    • one year ago
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    true

  107. anonymous
    • one year ago
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    so really .28 or 0.28 because ales is very specific on it

  108. geerky42
    • one year ago
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    I would go with 0.28

  109. anonymous
    • one year ago
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    ok @geerky42 last one promise

  110. geerky42
    • one year ago
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    |dw:1433964384649:dw|

  111. geerky42
    • one year ago
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    sorry no need to use graph

  112. geerky42
    • one year ago
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    But here, "input" is time spending in texting. Here, you have x = 4 So plug that into best fit line \(y = -0.73x+8.53\)

  113. anonymous
    • one year ago
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    5.61

  114. geerky42
    • one year ago
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    \[y = -0.73(\bf\color{blue}4)+8.53\]

  115. geerky42
    • one year ago
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    yeah 5.61 is your answer.

  116. anonymous
    • one year ago
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  117. anonymous
    • one year ago
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    alright man thanks so much @geerky42

  118. geerky42
    • one year ago
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    No problem

  119. anonymous
    • one year ago
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    and um how do you do those gifs lol

  120. geerky42
    • one year ago
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    |dw:1433964611059:dw|

  121. geerky42
    • one year ago
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    I will make tutorial of it by tonight. Check tomorrow.

  122. anonymous
    • one year ago
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    but how on drawing????

  123. geerky42
    • one year ago
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    I will make tutorial later, I promise. Check tomorrow.

  124. geerky42
    • one year ago
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    It's little complicated.

  125. anonymous
    • one year ago
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    ok message us tommorow

  126. geerky42
    • one year ago
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    I will tag. You want message anyway?

  127. anonymous
    • one year ago
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    sure

  128. geerky42
    • one year ago
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    What about you? Or nah? @Mromanos96

  129. anonymous
    • one year ago
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    yeah tag me also

  130. geerky42
    • one year ago
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    ok I will tag both you

  131. anonymous
    • one year ago
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    geerky is a new moderator lol

  132. geerky42
    • one year ago
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    I wish lol.

  133. anonymous
    • one year ago
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    but how can you be a moderator anyways

  134. anonymous
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    a beginner have done it

  135. geerky42
    • one year ago
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    You got to apply somewhere... I don't know because I was planning on doing that anyway lol.

  136. anonymous
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    |dw:1433964783733:dw|

  137. geerky42
    • one year ago
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    You can ask that on OpenStudy feedback.

  138. anonymous
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    lol he'd be the number one

  139. geerky42
    • one year ago
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    I wasn't planning*

  140. anonymous
    • one year ago
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    i copyed yours lol

  141. geerky42
    • one year ago
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    I can see that ;)

  142. anonymous
    • one year ago
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    lol

  143. anonymous
    • one year ago
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    we are /\tlas we will follow we will not forget and we will not forgive

  144. anonymous
    • one year ago
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    bye

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is replying to Can someone tell me what button the professor is hitting...

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