Radius
A segment from the center of a circle to any point on the circle
The radius is a measurement of a circle, which refers to the distance from the center of the circle to any point on its circumference. It is denoted by the letter r. The radius is always half the diameter of a circle. Thus, if we know the diameter of a circle, we can calculate the radius by dividing the diameter by 2. Similarly, if we know the circumference of a circle, we can calculate the radius by dividing the circumference by 2π (pi). The radius is an important parameter used in the calculation of the area and circumference of a circle.
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