A four sided regular polygon with one angle 90^o is called

At 5:20 the angle formed between the two hands of a clock is

At 6 o' clock the angle formed between the hands of a clock is

When two line segments meet at 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

An angle which measures 0^o is called

An angle which measures 90^o is called

In figure angle AOB=