Parts of a Circle

Front

What is the definition of 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 the center of a circle?

Back

The center of a circle is the fixed point from which all points on the circle are equidistant.

Front

What is a radius?

Back

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

Front

What is a diameter?

Back

A diameter is a line segment that passes through the center of the circle and has its endpoints on the circle. It is twice the length of the radius.

Front

What is a chord?

Back

A chord is a line segment whose endpoints lie 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 the point of tangency?

Back

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

Front

What is a central angle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides intersect the circle.

Front

What is an inscribed angle?

Back

An inscribed angle is an angle formed by two chords in a circle which have a common endpoint.

Front

What is an intercepted arc?

Back

An intercepted arc is the arc that lies in the interior of an inscribed angle and has endpoints on the angle.