Radius
Measurement from the center of a circle to the edge (half way across)
The radius of a circle is the distance from the center of the circle to any point on the circumference of the circle. It is commonly denoted by the letter r and is measured in units of length, such as centimeters (cm) or meters (m). The radius of a circle is half of its diameter, which is the distance from one side of the circle to the other side passing through the center. The formula to calculate the circumference (C) of a circle based on its radius (r) is C = 2πr where π is the mathematical constant pi (approximately equal to 3.14). The area (A) of a circle based on its radius (r) can be calculated by using the formula A = πr^2. The radius of a circle plays a crucial role in defining and studying various geometric properties of the circle.
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