If radii of two concentric circles are 4 cm and 5 cm then the length of each chord of one circle which is tangent to the other circle is: A). 3 cm B). 6 cm C). 9 cm D). 1 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?