Circle Vocabulary

Front

What is a Circumscribed Angle?

Back

An angle formed by two lines that intersect outside a circle, with the vertex of the angle located outside the circle.

Front

What is a Minor Arc?

Back

An arc that is smaller than a semicircle, defined by two endpoints on the circle.

Front

What is a Major Arc?

Back

An arc that is larger than a semicircle, defined by two endpoints on the circle.

Front

What is a Radius?

Back

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

Front

What is a Diameter?

Back

A line segment that passes through the center of a circle and has its endpoints on the circle, equal to twice the radius.

Front

What is a Central Angle?

Back

An angle whose vertex is at the center of the circle and whose sides are radii that extend to the circle.

Front

What is a Secant?

Back

A line that intersects a circle at two points.

Front

What is a Chord?

Back

A line segment whose endpoints lie on the circle.

Front

What is a Tangent?

Back

A line that touches the circle at exactly one point.

Front

What is the Circumference of a Circle?

Back

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