Question

3. The circumference of a circle is 4pi. Find the area of the circle.​

Answer 1

Answer:

The perimeter of the circle (also known as the circumference) is 4π.

(C = 4π or 4 * 3.14 = 12.56)

The formula for the area of a circle is the following:

S = π * r^2 where r = radius of circle

First, to find r (radius) substitute in the formula for the circumference.

C = 2 * π * r

4π = 2π * r

r = 4π / 2π

r = 4 / 2

r = 2 ==> radius = 2 units

Next, plug the value of r in the formula for the area of the circle.

S = π * r^2

S = 3.14 * 2^2

S = 3.14 * 4

S = 12.56 ==> area = 12.56 or ~12.6 square units

Answer 2

4 pi is answer

2pir=4pi
Therefore r= 2
Area of circle =pi r^2
Area= 4pi