## Radius

### In geometry, the radius of a circle is defined as the distance from the center of the circle to any point on its circumference

In geometry, the radius of a circle is defined as 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 the circle, which means if the diameter is known, we can calculate the radius by dividing it by 2.

The radius plays an important role in many mathematical calculations involving circles. Some key properties and formulas associated with the radius are:

1. Circumference: The circumference of a circle is the distance around its outer edge. It can be calculated using the formula C = 2πr, where π is a mathematical constant approximately equal to 3.14159.

2. Area: The area of a circle is the region enclosed by its circumference. The formula to calculate the area is A = πr^2.

3. Sector: A sector is a region of a circle enclosed by two radii and the corresponding arc. The area of a sector can be calculated by using the formula A = (θ/360)πr^2, where θ represents the central angle of the sector.

4. Length of an arc: An arc is a portion of the circumference of a circle. The length of an arc can be found using the formula L = (θ/360)2πr, where θ represents the central angle of the arc.

Additionally, the radius is used to define other geometric figures. For example, in a sphere, the radius is the distance from the center to any point on its surface. In a cylinder, the radius refers to the distance from the center of the circular base to any point on its circumference.

Understanding the concept of radius and its applications is crucial in various fields, including physics, engineering, and computer science, where circles and spheres are frequently encountered.

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