Question

find the radius of a circle whose circumference is-31.4m
​

Answer 1

Answer:

As we know that circumference of the circle is given as-

Circumference =2πr

Given:-

Circumference of the circle =31.4cm

∴2πr=31.4

⇒2×3.14×r=31.4

⇒r=5cm

Now again as we know that the area of the circle is given as-

Area =πr

2

⇒ Area =3.14×(25)

2

=78.5cm

2

Hence the radius and area of the circle is 5cm amd 78.5cm

2

respectively.

Answer 2

Answer:

5cm

Step-by-step explanation:

2πr=31.4 cm

2×22/7×r=31.4cm

=5cm