Circle Vocabulary

Front

What is an arc with endpoints that are the endpoints of a diameter of the circle?

Back

Semicircle

Front

What is a line segment with one endpoint on the center of the circle and one on the circle?

Back

Radius

Front

What is an angle whose vertex is the center of the circle?

Back

Central Angle

Front

What is a line that intersects the circle in two points?

Back

Secant

Front

What is an unbroken part of a circle consisting of two points called the endpoints and all the points between them?

Back

Arc

Front

What is the distance around a circle called?

Back

Circumference

Front

What is the longest chord in a circle?

Back

Diameter

Front

What do you call a line that touches the circle at exactly one point?

Back

Tangent

Front

What is the term for the distance from the center of the circle to any point on the circle?

Back

Radius

Front

What is the measure of the angle formed by two radii of a circle?

Back

Central Angle