Question

The circumference of a circle is 31.4 cm .Find the radius​

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:

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

As we know that circumference of the circle is given as-Circumference =2πr

As we know that circumference of the circle is given as-Circumference =2πrGiven:-

As we know that circumference of the circle is given as-Circumference =2πrGiven:-Circumference of the circle =31.4cm

As we know that circumference of the circle is given as-Circumference =2πrGiven:-Circumference of the circle =31.4cm∴2πr=31.4

As we know that circumference of the circle is given as-Circumference =2πrGiven:-Circumference of the circle =31.4cm∴2πr=31.4⇒2×3.14×r=31.4

As we know that circumference of the circle is given as-Circumference =2πrGiven:-Circumference of the circle =31.4cm∴2πr=31.4⇒2×3.14×r=31.4⇒r=5cm