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}=(20ft)/(2)=10ft`

The lateral area of a cone = πrl

`\begin{gathered} \pi rl=3.142*10*\text{ 32} \\ lateralarea=1005.3 \end{gathered}`

The surface area of a cone = πr² + πrl