The outer diameter of a gas cylinder is 20 cm. Find the cost of the painting of its outer curved surface at ₹ 4 per square centimetre if the height of the cylinder is 70 cm.

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?