i. Radius of the circle (r) = 28 cm … [Given]
Area of the circle = πr2
= (22/7) x (28)2
= (22/7) x 28 x 28
= 22 x 4 x 28
= 2464 sq. cm
ii. Radius of the circle (r) = 10.5 cm … [Given]
Area of the circle = πr2
= (22/7) x (10.5)2
= (22/7) x 10.5 x 10.5
= 22 x 1.5 x 10.5
= 346.5 sq. cm
iii. Radius of the circle (r) = 17.5 cm … [Given]
Area of the circle = πr2
= (22/7) x (17.5)2
= (22/7) x 17.5 x 17.5
= 22 x 2.5 x 17.5
= 962.5 sq. cm