The circumference of a circle is 31.4 cm. Find the radius and the area of the circle (Take π = 3.14)?

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Given:

Circumference = 31.4 cm

π = 3.14

As we know,

The formula for the circumference of a circle = 2 π r

So, 31.4 = 2 x 3.14 x r

31.4 = 6.28 x r

r = 31.4 / 6.28 = 5 cm

Now,

The formula for area of a circle = π r2

Area = 3.14 x 52 = 3.14 x 5 x 5 = 78.5 cm2

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