POQ is a line. Ray OR is a perpendicular to line PQ. OS is another ray lying between rays OP and OR. Prove that∠ROS=1/2(∠QOS−∠POS) .

What are the differences between similar triangles and congruent triangles?

What are Armstrong numbers?

All real numbers are rational numbers.

A) True

B) False

The L.C.M of the smallest 2 digit composite number and the smallest composite number is:

• (a) 12
• (b) 4
• (c) 20
• (d) 44

Are all natural numbers also whole numbers?