# Frustum of a cone

A reservoir contains 28.54 m3 of water when completely full. The diameter of the upper base is 3.5 m while at the lower base is 2.5 m. Determine the height if the reservoir is in the form of a frustum of a right circular cone.

Result

h =  4.001 m

#### Solution:

$V=28.54 \ \text{m}^3 \ \\ D_{1}=3.5 \ \text{m} \ \\ D_{2}=2.5 \ \text{m} \ \\ \ \\ r_{1}=D_{1}/2=3.5/2=\dfrac{ 7 }{ 4 }=1.75 \ \text{m} \ \\ r_{2}=D_{2}/2=2.5/2=\dfrac{ 5 }{ 4 }=1.25 \ \text{m} \ \\ \ \\ V=\dfrac{ 1 }{ 3 } \cdot \ \pi \cdot \ h ( r_{1}^2 + r_{1} \cdot \ r_{2} + r_{2}^2) \ \\ \ \\ h=\dfrac{ 3 \cdot \ V }{ \pi \cdot \ ( r_{1}^2 + r_{1} \cdot \ r_{2} + r_{2}^2) }=\dfrac{ 3 \cdot \ 28.54 }{ 3.1416 \cdot \ ( 1.75^2 + 1.75 \cdot \ 1.25 + 1.25^2) } \doteq 4.0005 \doteq 4.001 \ \text{m}$

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