Circle Vocabulary

Front

What is the definition of a Radius?

Back

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

Front

What is a Diameter?

Back

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

Front

Define a Chord.

Back

A chord is a line segment whose endpoints both lie on 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 a Tangent Line?

Back

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

Front

What is a Secant?

Back

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

Front

What is a Major Arc?

Back

A major arc is an arc that is larger than a semicircle.

Front

What is a Minor Arc?

Back

A minor arc is an arc that is smaller than a semicircle.

Front

Define a Central Angle.

Back

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

Front

What is the relationship between a Radius and a Diameter?

Back

The diameter is twice the length of the radius.