Parts of a Circle

Front

What is a Circle?

Back

A circle is a set of points in a plane that are equidistant from a fixed point called the center.

Front

What is a Radius?

Back

A radius is a line segment from the center of a circle to any point on the circle.

Front

What is a Chord?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is a Diameter?

Back

A diameter is a chord that passes through the center of the circle and is the longest chord.

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 enclosed by the circle, calculated as A = πr², where r is the radius.

Front

What is a Sector?

Back

A sector is a region of a circle bounded by two radii and the arc between them.