Parts of a Circle

Front

What is a Circle?

Back

A circle is a shape consisting of all points in a plane that are at a given distance from a fixed point, called the center.

Front

What is the Radius of a Circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is a Diameter?

Back

The diameter is a straight line passing from side to side through the center of a circle, and it is twice the length of the radius.

Front

What is a Chord?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is a Tangent?

Back

A tangent is a line that touches the circle at exactly one point.

Front

What is a Secant?

Back

A secant is a line that intersects the circle at two points.

Front

What is a Point of Tangency?

Back

A point of tangency is the point where a tangent touches the circle.

Front

What is the Circumference of a Circle?

Back

The circumference is the distance around the circle, calculated as C = 2πr, where r is the radius.

Front

What is the Area of a Circle?

Back

The area is the space contained within the circle, calculated as A = πr².

Front

What is a Sector of a Circle?

Back

A sector is a portion of a circle enclosed by two radii and the arc between them.