## tayluvsya 2 years ago help plez

1. tayluvsya

2. ZeHanz

You are probably aware of the formula to calculate the volume of a sphere with radius r:$V=\frac{ 4 }{ 3 }\pi r^3$so you only need to convert the diameter (28 cm) to the radius, and put that value into the formula...

3. tayluvsya

thnks @ZeHanz

4. ZeHanz

YW! ;)

5. tayluvsya

i still didnt get it right i need the answer plez

6. tayluvsya

its soooooooo confusing

7. AravindG

can u show ur working ? let me see where are u getting stuck

8. tayluvsya

i dont get it at all

9. AravindG

just do what zehanz said above :)

10. AravindG

just use the formula !

11. tayluvsya

i dont get it

12. AravindG

what value did u get for r ?

13. lilcici

28

14. ZeHanz

No, 28 is the diameter :(

15. lilcici

so 24

16. lilcici

$V=\frac{ 4 }{ 3 } \pi 24^{3}$

17. ZeHanz

In a circle, the radius is half the diameter, so if the diameter is 28, the radius is 14. If you want to solve problems such as the above, this knowledge is rather essential, I'm afraid...

18. lilcici

im srry just tired forgot to half my problem thnks for correcting me

19. ZeHanz

yw!

20. lilcici

$V=\frac{ 4 }{ 3 } \pi 14^{3}=11494.04032$

21. ZeHanz

Right! So if you round to the nearest 500, you'll have the answer option of the original problem.

22. lilcici

thnks again