**Circle**

A circle is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The radius of a circle is the distance from the center of a circle to any point on the circle. The Diameter starts at one side of the circle, goes through the center and ends on the other side. Watch Circle Video to learn more.

**Circle geometry**

A circle is an important shape in the field of geometry. Let’s look at the definition of a circle and its parts. We will also examine the relationship between the circle and the plane. A circle is a shape with all points the same distance from its center. A circle is named by its center. Thus, the circle to the right is called circle A since its center is at point. A. Some real world examples of a circle are a wheel, a dinner plate and (the surface of) a coin. A central angle is an angle formed by two intersecting radii such that its vertex is at the center of the circle.

**Radius of a circle**

A circle is the set of all points in a plane. The distance from the centre of the circle to any point on a circle is the radius and the line starts from one point of circle , goes through the centre and ends on the other end of the circle is known as diameter.

**Diameter of a circle**

The distance across a circle through the center is called the diameter. The radius of a circle is the distance from the center of a circle to any point on the circle and the diameter is the twice of the radius.

**Circle Video**

Useful for CBSE, ICSE, NCERT & International Students

Grade : 9

Subject : Maths

Lesson : Circles

Topic: Circle Video

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