A ladder is placed in a slanting position against a wall such that it touches it 20 m above the ground. The foot of the ladder is 15 m away from the bottom of the building. What is the length of the ladder?

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?