Question

Find the area of circular ring whose external and internal radii are 21 centimetre and 14 cm respectively

Answer 1

area of ring=area of bigger 0-area of smaller0
Π×21×21-Π14×14
441Π-196Π
245Π
22/7×245
770cm sq.

Answer 2

Answer:

PLEASE MARK ME BRAINLIST...