The circumference of a circle is 31.4 cm. Find the radius and the area of the circle. (Take π = 3.14)
It is given in the question that,
Circumference of circle = 31.4 cm
We know that,
Circumference of the circle = 2πr
∴ 31.4 = 2 × 3.14 × r
31.4 = 6.28 × r
⇒ r = 31.4/6.28
⇒ r = 5 cm
Area of the circle = πr2
= 3.14 × 5 × 5
= 3.14 × 25
= 78.5 cm2