A right cone has a slant height of 7 and a radius of 5. What is its surface area?
1 Answer
Feb 22, 2016
A surface area of a cone is the lateral area plus the area of the base
The lateral area of a cone is
The base area of a cone is
Therefore, the total surface area is
We are given both variables l and r, so we just have to plug in
The surface area is approximately 188.5