If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.
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3850m is the area of the a circle whose radius of 7meaters
A circle with a radius of 13 units has an area of 530.93 square units.
The area of a circle, if the radius is 5 cm, is: 78.54 cm2
A circle with a radius of 11m has an area of ~380.13 m2
Equation for the area circle = pi x radius squared If the area is 144pi, then you need to find the square root of 144, which is 12. Therefore, radius = 12