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anonymous

  • 5 years ago

how do you find the area of a trapezoid?

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  1. dumbcow
    • 5 years ago
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    general formula h=height b1=bottom base length b2=top base length A = (1/2)*h*(b1+b2)

  2. anonymous
    • 5 years ago
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    so I don't need to worry about the side length and degree that they gave me?

  3. dumbcow
    • 5 years ago
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    for area no as long as you have all the other information you need

  4. anonymous
    • 5 years ago
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    I don't have the height but have a side length

  5. dumbcow
    • 5 years ago
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    set up right triangle by drawing line straight down from where side meets top

  6. dumbcow
    • 5 years ago
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    which angle did they give you, top or bottom?

  7. anonymous
    • 5 years ago
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    they gave me bottom so instead of hte right angle being 90 it's 65 then the angle opposite is 90 and top is 25 the hypotenuse is 14in

  8. dumbcow
    • 5 years ago
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    ok to find height you have use trig sin65 =opposite/hypotenuse = h/14 h = 14*sin65

  9. anonymous
    • 5 years ago
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    which is about 12.7 now I just plug it in

  10. anonymous
    • 5 years ago
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    A=.5(12.7(12+25)) A= about 235

  11. anonymous
    • 5 years ago
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    thanks

  12. dumbcow
    • 5 years ago
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    good ;)

  13. anonymous
    • 5 years ago
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    wait lol my teacher showed me how to do this next one but I forgot it

  14. anonymous
    • 5 years ago
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    tanx=-1 given that 0 degrees is less than or equal to x which is less than or equal to 360 degrees

  15. dumbcow
    • 5 years ago
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    tanx = sinx/cosx tanx = -1 so sinx/cosx = -1 multiply cosx on both sides sinx = -cosx for what x on unit circle is sin opposite of cos

  16. anonymous
    • 5 years ago
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    we are solving for x

  17. dumbcow
    • 5 years ago
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    thats what i am assuming

  18. anonymous
    • 5 years ago
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    yes

  19. dumbcow
    • 5 years ago
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    do you have a unit circle?

  20. dumbcow
    • 5 years ago
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    this is for w/out calculator if you are allowed to use calculator you could enter arctan(-1)

  21. anonymous
    • 5 years ago
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    I'm using a TI-83 a way old version of graphing calcs

  22. anonymous
    • 5 years ago
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    and no unit circle

  23. dumbcow
    • 5 years ago
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    haha hey thats what i use ok what do you get when you enter arctan(-1)

  24. anonymous
    • 5 years ago
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    and exactly how am I supposed to enter arctan(-1)? lol

  25. dumbcow
    • 5 years ago
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    theres a tan^-1 above the tan button

  26. anonymous
    • 5 years ago
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    the inverse of tan is = arctan(-1)?

  27. dumbcow
    • 5 years ago
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    yes sorry inverse tan is also called arctan

  28. anonymous
    • 5 years ago
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    -45?

  29. dumbcow
    • 5 years ago
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    good but 0<x<360 -45 = 360-45

  30. anonymous
    • 5 years ago
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    is there no value?

  31. dumbcow
    • 5 years ago
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    neg angle just refers to direction 315 degrees in positive direction is same as 45 degrees in negative direction think of a circle

  32. anonymous
    • 5 years ago
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    ok got it thanks:)

  33. dumbcow
    • 5 years ago
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    i see you

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