A quadrilateral whose all four sides are equal and all four angles are 90^o is called a

The sum of angles in a triangle is

89^o is an example of

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

179^o is an example of

The common end point where the two rays meet is called

Number of rays that can be drawn from a given point is

The shape of a pencil box is

An angle which measures 90^o is called

Each angle of a square is of  measure