## anonymous one year ago Circle A is shown with a central angle marked 37 degrees and the radius marked 10 inches. Which of the following could be used to calculate the area of the sector in the circle shown above? π(10in)237 over 360 π(10in)37 over 360 π(37in)210 over 360 π(37in)10 over 360

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1. anonymous

im a noob a math

2. anonymous

*at*

3. jim_thompson5910

Hint: area of slice = $$\LARGE \frac{x}{360}*\pi*r^2$$ x is the angle in degrees r is the radius

4. anonymous

i don't understand how to use pi in equations

5. jim_thompson5910

what I would do is pull out the pi and ignore it temporarily

6. jim_thompson5910

In this case, x = 37 degrees and r = 10 if r = 10, then what is the value of r^2 ?

7. anonymous

100

8. anonymous

so x*r^2 is 3700?

9. anonymous

someone help me

10. anonymous

:(

11. jim_thompson5910

so, $\Large \frac{x}{360}*\pi*r^2 = \frac{37}{360}*\pi*10^2$ $\Large \frac{x}{360}*\pi*r^2 = \frac{37}{360}*\pi*100$ then you can rearrange terms

12. jim_thompson5910

hmm strange how none of the answer choices match

13. anonymous

well i don't know which one

14. anonymous

i asked one of my friends and he has no clue

15. jim_thompson5910

can you post a screenshot of the full problem?

16. anonymous

how im using a mac i don't know how

17. jim_thompson5910

http://www.take-a-screenshot.org/ click on the "mac" tab to have the instructions shown

18. anonymous

here?

19. anonymous

wait

20. jim_thompson5910

on the link I posted. They show the instructions on how to take a screenshot

21. anonymous

it doesn't work i tried all of them

22. jim_thompson5910

did you hold the command key and shift key, then press the "3" key? (the '3' over the 'w' and 'e') you should see a new pic file show up on your desktop

23. anonymous

yes

24. jim_thompson5910

ok post that by attaching the file (click the attach file button under the text box)

25. anonymous

well no picture but i tried and it didn't work

26. jim_thompson5910

the file name will be something like Screen shot 2015-08-31 at 08.45.00 AM.png

27. anonymous

no its not working

28. jim_thompson5910

ok nvm then

29. anonymous

what do i do now with the equation?

30. jim_thompson5910

sorry I don't know. None of the answer choices match what I wrote above, so I'm stumped. I think there's a typo maybe?

31. jim_thompson5910

that's why I wanted to see the screenshot so I could see if anything was missing or not

32. anonymous

33. anonymous

yay

34. jim_thompson5910

can you post an image of the answer choices as well?

35. anonymous

only like that π(10in)237 over 360 π(10in)37 over 360 π(37in)210 over 360 π(37in)10 over 360

36. anonymous

the question says: Which of the following could be used to calculate the area of the sector in the circle shown above?

37. jim_thompson5910

does any of the answer choices have $$\Large 10^2$$ in it?

38. anonymous

the first 2

39. jim_thompson5910

so choice B is $\Large \frac{\pi(10^2)37}{360}$ ??

40. anonymous

no lemme make that equation wait a sec

41. anonymous

crud its not working its just pi*10*(37/360)

42. anonymous

or the 2nd one just with 10^2 instead of 10

43. jim_thompson5910

ok, so the "10" should be "10^2" because of the r^2 in pi*r^2

44. anonymous

ok

45. anonymous

look: π(10in^2)237 over 360 π(10in)37 over 360 π(37in^2)210 over 360 π(37in)10 over 360

46. anonymous

are you here?

47. jim_thompson5910

so strange, it shouldn't be 10in^2 it should be 10^2 in^2 maybe that's what they meant?