How do you work out the slant height of a cone?

Answer:
The slant height is the hypotenuse of the right triangle formed by the height of the cone and the radius of the base. Use the Pythagorean theorem.

The Pythagorean theorem (radius)2 + (perp. height)2 = (slant height)2
First answer by Carayoshi. Last edit by Marizka. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 1 [recommend question].