If the radius of a circle is increased by 4 times then its diameter increases by: 

The lines which lie on the same plane and do not intersect at any point are called: 

When an arm of an angle is extended than the measure of angle: 

A line AB is parallel to the line CD. This is symbolically written as: 

In ∠PRQ the two arms are: 

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

If 9.2cm is the diameter of a circle then its radius is: 

The sum of all the three angles in a triangle is: 

At 5.20 the angle formed between the two hands of a clock is: 

When two rays emerge from a common point __________ is formed.