Expert: Lynn Houston - 5/29/2011

Question
find the volume of a cone that is 18in. high and has a 6in. radius

Answer
for a cone with height h and base radius r, the volume, V of the cone will be:

v= (1/3)(pi)(r^2)(h)

where π is a number that is approximately equals to 3.14.

You have h and r, so just plug them into the eq to get

v = (1/3)(3.14)(6^2)(18)
v = (1/3)(3.14)(36)(18)
v = (1/3)(3.14)(648)
v = (1/3)(3.14)(648)
v = 3.14(216)
v = 68.75 in^3

I used a scientific calculator for pi, but if you just use 3.14, your answer would be

68.78 in^3