## anonymous one year ago Find the exact area of the region bounded by two concentric circles with radii 10 inches and 6 inches. a) 16pi b) 64pi c) 88pi

1. anonymous

@satellite73

2. anonymous

@TheSmartOne

3. anonymous

big area minus small earea

4. anonymous

$\pi r^2$ big area is $100\pi$

5. anonymous

small area ?

6. anonymous

big area minus small area =211 right/

7. anonymous

?

8. anonymous

i think you are missing that there has to be a $$pi$$ in the answer

9. anonymous

Wait what?

10. anonymous

Oh

11. anonymous

$100\pi-36\pi=?$

12. anonymous

87pi

13. anonymous

So the answer is C?

14. anonymous

your arithmetic is worse than mine even !!

15. anonymous

Really/

16. anonymous

$100-36=?$

17. anonymous

Oh it's 77

18. anonymous

lolol

19. anonymous

you need a calculator

20. anonymous

Sorry. I know it's like 10:30 in the morning, but it takes me awhile to wake up

21. anonymous

yeah here too

22. anonymous

Really?

23. anonymous
24. anonymous

let me know when you get $$64\pi$$ ...

25. anonymous

is this clear or no? (no is a fine answer, just asking)

26. anonymous

Omg I do need a calculator

27. anonymous

Ima go get one real quick off google

28. anonymous

I used to be good at this

29. anonymous

use the link i sent wolfram alpha is great

30. anonymous

not that you need a calculator to subtract $$100-36$$ but still

31. anonymous

Oh okay nevermind then. I done already looked at it

32. anonymous

yeash

33. anonymous

I just realized that 100-30=70 and 100-36=64 cus 10-6=4

34. anonymous

however you like to think about it, yes

35. anonymous

Oh and can you help this one kid with his algebra? He's new to the site and he looks like he needs help

36. anonymous

sure why not?

37. anonymous

who is it?

38. anonymous

The same kid you tried to help before. He still doesn't understand what you told him and now he's calling to me for help and I don't necessarily remember how to do this stuff

39. anonymous

@satellite73