The height and base diameter of a circular cone are 27 cm and 12 cm respectively. If the cone is cut into two portions by a plane parallel to it base and the base diameter of the upper cone is 4 cm, find the volume of the lower portion.
@ageta @ganeshie8

Question

The height and base diameter of a circular cone are 27 cm and 12 cm respectively. If the cone is cut into two portions by a plane parallel to it base and the base diameter of the upper cone is 4 cm, find the volume of the lower portion. 
@ageta @ganeshie8

anonymous · Answer

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ageta · Answer

i am not sure but i think it is 8.

anonymous · Answer

The volume of the lower portion is 312pi cm3 but i dont know why

ageta · Answer

this is hard

ganeshie8 · Answer

As a start : find the volume of the entire cone

anonymous · Answer

ahh i know it now haha

anonymous · Answer

i didnt know the height of the upper portion before. is it 9 cm?

ganeshie8 · Answer

you don't need the height of small cone

ganeshie8 · Answer

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