Area of cone and frustum. This video derives the area of a cone and thus obtains the area of a frustum (a cone with the top sliced off). The area for the frustum is expressed in three different ways. The last is useful for calculating surface areas of revolution.
Tags: Area of cone and frustum, Mathematics, Maths, Math, Plymouth University, Cone area, Frustum area, Frustum, Conic sections, Surface area of revolution