Circles Vocabulary

Front

What is a Chord in a circle?

Back

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

Front

What is a Tangent in relation to a circle?

Back

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

Front

What is a Secant in a circle?

Back

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

Front

What is the Diameter of a circle?

Back

The diameter is a chord that passes through the center of the circle, and it is the longest chord.

Front

What is the Center of a circle?

Back

The center is the point that is equidistant from every point on the circumference of 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 are radii.

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 Exterior Angle in a circle?

Back

An exterior angle is formed outside the circle by two secants or a secant and a tangent.

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 Radius of a circle?

Back

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