Question

what is the circumference and radius if the area is 12.56

Answer 1

We'll recall the formula that gives the circumference of a circle:

C = 2pi r, where r is the radius of the circle.

If the diameter of a circle is twice it's radius, then the circumference formula can be written as:

C = Dpi , where D represents the diameter of the circle.

We'll plug in the given values:

12.56 = D*pi

D = 12.56/pi

We'll take pi = 3.14

D = 12.56/3.14

D = 4 cm

Therefore, the diameter of the circle, whose circumference measures 12.56 cm, is D = 4 cm.