i got this answer wrong and i don't know why

Question

word2 · Answer

A cylinder has a radius of 5 feet and a height of 8 feet. Which of the following can be used to calculate the volume of a cone that fits exactly inside the cylinder?

> (3.14)(52)(8)

 1 over 3(3.14)(52)(8)

 (3.14)(82)(5)

 1 over 3(3.14)(82)(5)

word2 · Answer

this makes no sense to me because the formula for volume is V= pi * r^2*h

word2 · Answer

so basically the answer should be V=(3.14)*(5^2)(8)

loser66 · Answer

The question is about the CONE, not the cylinder!!

legomyego180 · Answer

Thats the volume of the cylinder. Kind of a trick question.

word2 · Answer

but it says "Cylinder"

loser66 · Answer

|dw:1470002170165:dw|

legomyego180 · Answer

|dw:1470002152170:dw|

word2 · Answer

oh wow

word2 · Answer

it should have been  1 over 3(3.14)(5^2)(8)

jhonyy9 · Answer

the volume of a cone what fits exactly inside the cylinder will have a volume equal the 1/3 part from volume of cylinder 

do you know it why ?

legomyego180 · Answer

yup

word2 · Answer

yeah @jhonyy9  , i understand this now

word2 · Answer

thank you everyone

jhonyy9 · Answer

was our pleasure and anytime 

good luck

bye bye