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
We appreciate your comment! You can either ask a question or review our blog. Thanks!!