A shape which has equal sides and equal angles is called a regular shape.
For example, a square is a regular shape. It has all its sides equal and all its interior angles equal to 90 degrees.

A rectangle has its opposite sides to be equal, in general.

There are 360 degrees in a circle.

An angle which measures 180°  is called a straight angle.

The letters G and P do not have any line of symmetry.
The letters B and V have only one line of symmetry each as shown below:
Thus, B and V are letters that have only one line of symmetry.

Objects which have no line of symmetry are called asymmetrical objects.

A shape which has equal sides and equal angles is called a regular shape.

In the figure shown, all sides are not equal. Hence, it is not a regular shape.