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gabbyalicorn

  • one year ago

What is the approximate perimeter of the figure? A. 7.85 in. B. 12.9 in. C. 17.9 in. D. 31.4 in.

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  1. gabbyalicorn
    • one year ago
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  2. geerky42
    • one year ago
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    This looks like 1/4 of circle, right?

  3. gabbyalicorn
    • one year ago
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    right

  4. geerky42
    • one year ago
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    yeah, so that arc would be 1/4 the circumference. Agree?

  5. gabbyalicorn
    • one year ago
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    yeppers

  6. geerky42
    • one year ago
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    And you also have two radii |dw:1433134466763:dw|

  7. geerky42
    • one year ago
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    You know what's total length of these thick lines?

  8. gabbyalicorn
    • one year ago
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    90 is the length?

  9. geerky42
    • one year ago
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    |dw:1433134560634:dw|

  10. geerky42
    • one year ago
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    That's 5+5

  11. gabbyalicorn
    • one year ago
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    oh 10

  12. geerky42
    • one year ago
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    Yep, easy part. Now arc. Again it's 1/4 of circumference, so what is it?

  13. gabbyalicorn
    • one year ago
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    is there anyway to convert 1/4 into like a number?

  14. geerky42
    • one year ago
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    You can just divide it by 4?

  15. gabbyalicorn
    • one year ago
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    2.5

  16. geerky42
    • one year ago
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    Or you can use calculator to find 1/4 \(1\div4\)

  17. geerky42
    • one year ago
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    It's not 2.5 btw

  18. gabbyalicorn
    • one year ago
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    0.25

  19. geerky42
    • one year ago
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    yeah, so you multiply circumference by 0.25

  20. gabbyalicorn
    • one year ago
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    but i thought the circumference is 0.25

  21. geerky42
    • one year ago
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    no no. it's just that you find whole circumference, THEN you multiply it by 0.25

  22. gabbyalicorn
    • one year ago
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    so, 4 x 0.25?

  23. gabbyalicorn
    • one year ago
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    no that wouldn't make sense

  24. geerky42
    • one year ago
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    What is circumference? \(C = 2\pi r\), right?

  25. geerky42
    • one year ago
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    Find that then you multiply it by 0.25

  26. geerky42
    • one year ago
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    \(\dfrac{C}{4}\) or \( 0.25C\)

  27. gabbyalicorn
    • one year ago
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    oh so 2 x 3.14 = 6.28 x 0.25 = 1.57

  28. geerky42
    • one year ago
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    you forgot radius. From picture, radius is 5, right?

  29. gabbyalicorn
    • one year ago
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    oh oops so then it would be 7.85

  30. gabbyalicorn
    • one year ago
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    A :D !!!

  31. geerky42
    • one year ago
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    Not quite

  32. geerky42
    • one year ago
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    That is correct, but you forgot to add two radii

  33. geerky42
    • one year ago
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    as final answer

  34. gabbyalicorn
    • one year ago
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    wait 2

  35. gabbyalicorn
    • one year ago
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    so 10

  36. gabbyalicorn
    • one year ago
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    instead of 5

  37. geerky42
    • one year ago
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    |dw:1433135159595:dw|

  38. gabbyalicorn
    • one year ago
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    -3- i thought we just did that...

  39. geerky42
    • one year ago
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    yeah we did. Now we add them together.

  40. geerky42
    • one year ago
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    |dw:1433135231571:dw|

  41. gabbyalicorn
    • one year ago
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    17.85

  42. geerky42
    • one year ago
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    |dw:1433135261928:dw|

  43. geerky42
    • one year ago
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    Yep.

  44. gabbyalicorn
    • one year ago
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    :D thank you so much! I know i cant really show it through typing but I REALLY APPRECIATE YOU HELPING ME! :D

  45. geerky42
    • one year ago
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    No problem!

  46. gabbyalicorn
    • one year ago
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    im looking at the answer but why does a havethe 1 not there?

  47. gabbyalicorn
    • one year ago
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    its c because we round right?

  48. gabbyalicorn
    • one year ago
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    @geerky42

  49. gabbyalicorn
    • one year ago
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    wait but it doesnt say to round

  50. gabbyalicorn
    • one year ago
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    okay well im going with A

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