Question

how to find circumference of circle if area is given​

Answer 1

Let's consider the area of circle is A and circumference of circle is C.

We know that the area of a circle of radius r is,

$\implies A = \pi r^2 \\ \\ \implies r^2 = \dfrac{A}{2} \\ \\ \implies r = \sqrt{\dfrac{A}{2}}$

We also know that the circumference of a circle of radius r is,

$\implies C = 2\pi r \\ \\ \implies C = 2 \pi \sqrt{\dfrac{A}{2}} \\ \\ \implies \boxed{\bf{C = 2 \sqrt{A \pi}}}$

Now if you are given the area of the circle, then you can simply apply this formula to get the circumference of the circle.

Hence, this is our required formula to find the circumference of circle if the area is given.

Answer 2

Answer:

QUESTION:

• How to find circumference of circle if area is given?

ANSWER:

By using the formula of circumference of circle C = 2√πA is designed to find a circle's circumference using the area (A).

The perimeter or circumference of the circle can be found using the equation C=2π(r), where r= the radius of the circle.

Since we have two semi-circles we can find the circumference of one whole circle with a radius of 4, which would be 8π.