Top surface of a raised platform is in the shape of a regular octagon as shown in the figure.Find the area of the octagonal surface.

Find the area of the given octagon.

A,B and C are the parallel sided transparent media of refractive index n_(1),n_(2) and n_(3) respectively. The are arranged as shown in the figure. A ray is incident at an angle theta on the surface of separation of A and B which is as shown in the figure. After the refraction into the medium B, the ray grazes the surface of separation of the media B and C. Then, sintheta =

Find the surface area of each of the following figure.

A wooden belan was made by using 3 wooden cylinders as shown in the figure. Find the total surface area of the belan.

The surface area of a sphere of radius 7 cm is

Two coins of diameter 2 cm and 4 cm respectively are kept one over the other as shown in the figure, find the area of the shaded ring shaped region in square cm.

The formula to find the curved surface area of a sphere is

What is the shape of equipotential surface around the point charge ?

Explain why Surface tension of a liquid is independent of the area of the surface.