Question

The area of a circle is 1386 sq.cm ; find its circumference.​

Answer 1

Answer :

• Circumference is 132 cm

Given :

• The area of a circle is 1386 sq.cm

To find :

• Circumference

Solution :

First we need to find the radius

Given that ,

• Area of circle = 1386 cm²

As we know that,

• Area of circle = πr²

》22/7 × r² = 1386

》r² = 1386 × 7/22

》r² = 441

》r = √441

》r = 21cm

Hence Radius is 21cm

Now we have to find the circumference

As we know that,

• Circumference = 2πr

》2 × 22/7 × 21

》2 × 22 × 3

》132

》132cm

Hence , Circumference is 132 cm