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Q.

If the diameter of a circle is 21 cm. Find its area.

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a

346.18 cm2

b

234 cm2

c

322 cm2

d

306 cm2

answer is A.

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Detailed Solution

Given: Diameter (d) = 21 cm

Radius (r) = d/2

r = 21/2

r = 10.5 cm 

Now, area = πr² = 3.14 x (10.5)2 = 346.185 cm2

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