Question

Identify the lateral area and surface area of a right cone with diameter 20 ft and slant height 32 ft.

Answer 1

Given the diameter and slant height of a cone:

Diameter of the cone = 20ft

$\text{radius = }\frac{\text{diameter}}{2}=\frac{20ft}{2}=10ft$

The lateral area of a cone = πrl

$\begin{gathered} \pi rl=3.142\times10\times\text{ 32} \\ lateralarea=1005.3 \end{gathered}$

The surface area of a cone = πr² + πrl

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