Question: how do u work out the surface area of a cone?
Answer: Make sure you use the same form of measurement as the radius. You can now use the measurement of the side to find the area of the cone. The formula for the area of a cone is 3.14 times the radius times the side (πrl). Example 1: A cone has a radius of 3cm and height of 5cm, find total surface area of the cone.