Radius
A segment from a point ona circle or a sphere to thecenter
Radius is the distance from the center of a circle to any point on the circumference of the circle. It is essentially the length of a line segment that extends from the center of the circle to any point on the circle’s perimeter. The radius is often abbreviated as r and is a critical measurement when calculating the circumference, area, and other properties of a circle. For example, the formula for the circumference of a circle is 2πr, where π (pi) is a mathematical constant that represents the ratio of a circle’s circumference to its diameter. The radius is also used extensively in geometry, trigonometry, physics, and many other fields.
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