Angles are measured in

179^o is an example of

Each angle of a square is of  measure

An angle which measures 90^o is called

An angle which measures more than 0^o and less than 90^o is called

The shape of a pencil box is

A figure bounded by three line segment is

The common end point where the two rays meet is called

An angle which measures 0^o is called

When two line segments meets at a point forming right angle they are said to be ________ to each other.