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Q.

Find the area of the circle whose diameter is 21 cm.

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a

346.18 cm2

b

350 cm2

c

400.8 cm2

d

180.2 cm2

answer is A.

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Detailed Solution

Given: Diameter (d) = 21 cm

Radius (r) = d/2 = 10.5 cm

Area of the circle = πr²

= 3.14×(10.5)2 = 3.14×10.5×10.5

= 346.18 cm2

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