Question

Radii of the circles are given below, find their areas.
(1) 28 cm
(2) 10.5 cm (3) 17.5 cm
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Answer 1

Your answers are 2464 , 346.5 and 962.5

Answer 2

(1) 28 cm

Area of circle = πr²
= 22/7×28² =
22/7×28×28
= 88×28
= 2464 sq.cm.

(2) 10.5 cm

Area of circle = πr²
= 22/7×10.5² =
22/7×10.5×10.5
= 22/7×110.25
= 346.5 sq.cm.

(3) 17.5 cm

Area of circle = πr²
= 22/7×17.5² =
22/7×17.5×17.5
= 22/7×306.25
= 962.5 sq.cm.