Identify the polygon

Sum of the Measures of the Exterior Angles of a

Polygon

A quadrilateral with each pair of opposite sides parallel.

Opposite angles are equal.

Opposite sides are equal.

Diagonals bisect one another.

Opposite angles are supplementary in parallelogram.

Diagonals bisect each other at right angle in rectangle.

Find the number of sides of a regular polygon whose each exterior angle has a measure of 60 $\degree$  

In the following polygons, which of the polygon is concave polygon?

How many diagonals have a regular hexagon?

In the following figure, given a parallelogram ABCD. Find x and y.

Two adjacent angles of a Parallelogram are in the ratio of

2 : 3. Find all the 4 angles of the Parallelogram.