Question

12. The circumference of a circle is 31.4 cm. Find the radius and the area of the circle
(Take 1 =3.14)

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Answer 1

Step-by-step explanation:

here,2πr=31.4cm

implies r=31.4/2π

(solve it)and area =πr^2

Answer 2

Answer:

Step-by-step explanation:

The circumference of the circle = 31.4 cm

⇒ 2π r = 31.4

⇒ 2 x 3.14 x r = 31.4

⇒ r =31.4/(2 x 3.14)  = 5 cm

Then area of the circle = πr²

= 3.14 x 5 x 5

= 78.5 cm²

Therefore, the radius = 5 cm

area of the circle = 78.5 cm²