# Truncated cone

Calculate the height of the rotating truncated cone with volume V = 794 cm3 and a base radii r1 = 9.9 cm and r2 = 9.8 cm.

Correct result:

h =  2.6 cm

#### Solution:

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Math student
can u explain why you do (r2 + rxR + R2) in the first step

1 year ago  3 Likes
Dr Math

Kukoslav
but to prove formula, you need to know how to solve integral

Kukoslav
need to solve a cubic equation, as obtained above, to find rises in heights... integral

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