Surface Area of a Cone
A cone does not have uniform (or congruent) crosssections. (more about conic section here) Example 1: A cone has a radius of 3cm and height of 5cm, find total surface area of the cone. Solution: To begin with we need to find slant height of the cone, which is determined by using Pythagoras, since the cross section is a right triangle. l 2 = h ...