If you are given the radius of the circle, you can use the formula:
diameter = 2*radius
If you are given the circumference of the circle, you can use the formula:
diameter = circumference/pi
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radius times two
Oh, dude, math time! So, the formula for finding the diameter of a circle from the circumference is dividing the circumference by π (pi). In this case, 49 divided by π is approximately 15.57 centimeters. So, the diameter of the circle is around 15.57 centimeters. Easy peasy, right?
Divide the circumference by pi, and that will give you the diameter. Then take half of the diameter (the radius), and plug it into the formula for the area of a circle (A=πr²)
Circumference of a circle is (pi * diameter). Area of a circle is (pi * r2).
Circumference = pi*d where d is the diameter.