## horsegal244 one year ago I Need Help I Will Give Fan And Medals!

1. horsegal244

A circular picture is 8 inches in diameter. Part A What is the area of the picture in square inches? A. 4π square inches B. 8π square inches C. 16π square inches D. 32π square inches Part B A frame that is 2 inches wide surrounds the picture. What is the total area of the picture and the frame in square inches? A. 4π square inches B. 12π square inches C. 36π square inches D. 40π square inches

2. horsegal244

@hybrik

3. anonymous

$A = \pi r^2$

4. horsegal244

ummmmm

5. anonymous

=π·42≈50.26548

6. horsegal244

I don't get it.......

7. anonymous

8. anonymous

what don't you get?

9. horsegal244

oh

10. horsegal244

But 42 is not in the answers...

11. anonymous

or 16 pi sry

12. welshfella

Part A = pi r^2 = pi 4^2

13. welshfella

14. anonymous

idk why I wrote 42 xD

15. welshfella

Part B the radius increases by 2 so area = pi * 6^2

16. horsegal244

@Chumpian How did you get that?

17. horsegal244

Part A

18. anonymous

$A = \pi r^2$ so 4 is the radius (r) and what's 4 squared?

19. horsegal244

16

20. anonymous

21. horsegal244

Now i need part B

22. anonymous

So again you use the equation $A = \pi r^2$

23. horsegal244

ok

24. anonymous

They said they added two inches to the frame

25. anonymous

so the radius is now 6

26. anonymous

So what do you do next?

27. welshfella

area = pi r^2 where r = radius r is now 6 so its pi * 6^2 = 36 pi

28. anonymous

Well I was gonna let her do that but thx xD

29. welshfella

oh sorry

30. horsegal244

Ok sry what is going on?

31. horsegal244

@Chumpian

32. anonymous

ok so the radius for part B is 6

33. horsegal244

ok

34. anonymous

We are doing the same thing as we did in part A

35. horsegal244

ok

36. anonymous

so what do we do with the radius that equals 6

37. horsegal244

idrk

38. anonymous

$A = \pi r^2$

39. horsegal244

Ok but that is A

40. anonymous

but we are doing the same thing as Part A but just with a larger radius

41. horsegal244

Ok

42. anonymous

So when we plug in the 6 $A = \pi 6^2$

43. anonymous

What do you do with the 6?

44. horsegal244

multiply is by itself so 12

45. anonymous

that would be 6 x 2 = 12 but squaring a number would be 6 x 6 = 36

46. horsegal244

Oh yea sorry

47. horsegal244

so then 36?

48. anonymous

yep and they want it in terms of pi So your answer is?

49. horsegal244

36π

50. anonymous

yep :)