The number of diagonals of a polygon of 20 of sides

The number of diagonals of a polygon of 15 sides is:

Find the numbers of diagonals in the polygon of n sides.

The number of diagonals of a convex polygon is 15 less than 4 times the number of its sides. The number of sides of the polygon be

The number of diagonals of a regular polygon is 27. Then, find the measure of each of the interior angles of the polygon.

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

No. of diagonals of a polygon are 170. No. of sides in this polygon are:

No. of diagonals of a polygon are 170. No. of sides in this polygon are:

The number of pairs of diagonals of a regular polygon of 10 sides that are parallel are

The interior angles of a regular polygon measure 150^@ each. The number of diagonals of the polygon is

In a polygon, no three diagonals are concurrent. If the total number of points of intersection of diagonals interior to the polygon is 70, then the number of diagonals of the polygon is a. 20 b. 28 c. 8 d. none of these