## niall1Dawesome one year ago Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. 1,256 ft2 4,189 ft2 1,089 ft2 1,568 ft2 Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3 4,187 ft3 1,089 ft3 1,568 ft3 Find the surface area for a sphere with a radius of 7 cm. Round to the nearest whole number. 307 cm2 1,436 cm2 1,020 cm2 615 cm2

1. niall1Dawesome

@qweqwe123123123123111

2. SithsAndGiggles

A = 4πr² V = 4/3 πr³

3. niall1Dawesome

is that too the first question??

4. niall1Dawesome

hey my friend says your really smart qwe

5. qweqwe123123123123111

6. qweqwe123123123123111

I'm not smart. I have google. :-)

7. niall1Dawesome

1256 is step a for question 1

8. qweqwe123123123123111

1256 is the answer to question 1.

9. niall1Dawesome

thats what i thought cause i did v and i was all liek wait what!!!

10. qweqwe123123123123111

Yes...volume will be somewhat larger... :-)

11. niall1Dawesome

i meant 3rd questions answer is 615.44

12. qweqwe123123123123111

Yes, 615 is question 3. :-)

13. niall1Dawesome

and on volume does he mean 1/3?

14. ryan123345

Area of Sphere Formula

15. qweqwe123123123123111

No. He means 4/3 (same as 1.33333.....) v = 4/3 pi r^3

16. ryan123345

$A = \frac{ 4 }{ \pi r^2 }$

17. ryan123345

so for the last one your equation would be.

18. niall1Dawesome

is it c?

19. ryan123345

$\frac{ 4 }{ \pi(49) }$

20. qweqwe123123123123111

C? No.

21. qweqwe123123123123111

What's pi * r^3 ?

22. qweqwe123123123123111

You still here?

23. niall1Dawesome

3140 sorry i wasnt there

24. niall1Dawesome

@tafkas77

25. tafkas77

Hi there! You mentioned me; what can I help you with? I'm not sure which question you're looking at. :)

26. niall1Dawesome

the middle one

27. tafkas77

Are you still trying to figure out the answer to #3?

28. tafkas77

.... Hello? @niall1Dawesome You there?

29. niall1Dawesome

sorry my computer was lagging really bad

30. niall1Dawesome

no number 2 i already know 1 and 3

31. niall1Dawesome

@tafkas77

32. tafkas77

Okay. I'm taking a look at this right now. :)

33. tafkas77

Eureka! I have the answer. :) Do you know the formula to calculate this?

34. niall1Dawesome

okay and hey you changed your icon cool

35. tafkas77

Ha ha, yeah. :) I felt like switching it up a bit. So do you know the formula to calculate this?

36. tafkas77

Are you still experiencing lag?

37. niall1Dawesome

a little

38. niall1Dawesome

and well isnt the formula V = 4/3 πr³

39. tafkas77

Okay, I think you are still experiencing a little lag. No worries, I can still help you with this. Hopefully when you see it, you'll get it! :) Perfect formula! :)

40. niall1Dawesome

ya your post jsut showed up

41. tafkas77

So let's plug in the values from your problem: $v = 4/3 * \pi * 10^3$ $v = 4/3 * \pi * 1,000$ When you plug this all in (you can do it on a calculator), you'll find that 4/3 = 1.3. so: $v = 1.3 * 3.14 * 1,000$ And then you'll get your answer. :)

42. niall1Dawesome

ok i will do that

43. niall1Dawesome

4082

44. tafkas77

Sorry; my mistake. You should have rounded 1.3 and input 1.4 (since 1.3333333... is irrational) and you would have gotten 4,187 :)

45. niall1Dawesome

oh lol

46. tafkas77

XD Hey, everyone makes mistakes... ugh... can't say that without thinking of Hannah Montana...

47. niall1Dawesome

hey can you check my answer to a question like this

48. tafkas77

yes I sure can! :)

49. niall1Dawesome

Find the volume for a sphere with a radius of 7 cm. Round to the nearest whole number. 307 cm2 1,436 cm2 1,020 cm2 615 cm2 im pretty sure its b but im going to redo the math

50. niall1Dawesome

hehe hannah montana lol

51. niall1Dawesome

yea i think it is b

52. tafkas77

You are absolutely correct. :)

53. niall1Dawesome

yay lol thx for helping me

54. tafkas77

You're welcome! :D

55. niall1Dawesome

:) everybody makes mistakes everybody has those days 1 2 3 4 lol i had too