How can we find the perimeter of a circle?

Can you think of surface area of the frustum?

How many cones you can see? Can you relate their radii?

Think of the faces of cap we can see.

What is the circumference of the circle?

Think of the curved surface area of cone and frustum of a cone.

Recall the formula for finding the volume of frustum of a cone.

Think about similar triangles.

Can you find the volume of all three portions seperately?

Bearing surface area is same as curved surface area.