A polygon has 90 diagonals . Find the number of its sides ?

A polygon has 77 diagonals. The number of sides of the polygon is

A polygon has 54 diagonals. Number of sides of this polygon is

A regular polygon of 10 sides is constructed. Triangles are formed joining vertices of the polygon. Find the number of triangles (i) if two sides of trinangle coincide with the sides of polygon. (ii) if only one side of triangle coincide with the side of polygon.

A polygon has 12 vertices lying on a circle. Find the number of diagonals.

The difference between any two consecutive interior angles of a polygon is 5^@ .If the smallest angle is 120^@ , find the number of the sides of the polygon.

The interior angles of a polygon are in arithmetic progression. The smallest angle is 120^@ and the common difference is 5^@ Find the number of sides of the polygon

The side of a rhombus is 13 cm and the length of one diagonal is 24 cm. Find the length of other diagonal?

Find the number of diagonals in the convex polygon of n sides .