Question

a frustum of cone has radii of 2 circular ends are 7cm and 4.2cm if it's depth is 14 cm what is it's volume?

Answer 1

R=7cm

r=4.2cm

h=14cm

volume=1/3πh(R²+r²+Rr)

=1/3×22/7×14[(7)²+(4.2)²+7×4.2]

=1/3×22×2[49+17.64+29.4]

=1/3×22×2×96.04

=1/3×22×2×9604/100

=422576/3×100

=140858.667/100

=1408.58667

=1408.59cm³

hope this answer will help you.

Answer 2

step by step instructions