The radius of a circle is a straight line from the centre of the circle to its circumference.
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It is the radious. I'm pretty sure
The radius of a circle is any straight line from the centre of the circle to its circumference. The radius can also refer to the length of this line.
Each segment of the circle graph represent a part of the whole.
It is not clear whether you want the formula of some aspect (area or circumference) of a circle when given its radius or a formula for its radius when given some characteristic measure of the circle.
What is the radius of a circle with a diameter of 4.56 m? The radius is half the diameter. Radius r = 2.28 m