In a regular polygon, any interior angle exceeds the exterior angle by 120 degrees. Then, the number of diagonals of this polygon is:

A regular octagon ABCDEFGH has sides of length 6 cm each. Then the area, in square cm, of the squar...

Regular polygons A and B have the number of sides in the ratio 1:2, and their interior angles are i...

In a square, lengths of the diagonals are $$ (4k + 6) \, \text{cm} $$ and $$ (7k - 3) \, \text{cm} ...

An exterior angle of a regular polygon is 24°. How many sides will the polygon have?...

In a rhombus ABCD, O is any interior point such that OA = OC. What is five-ninths of the degree meas...

In a rhombus PQRS, O is any interior point such that OP = OR. What is the degree measure of ∠SOQ?...