Naming Parts of Circles

Front

What is a sector in a circle?

Back

A sector is a portion of a circle enclosed by two radii and the arc between them.

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circle.

Front

What is a minor arc?

Back

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

Front

What is a diameter?

Back

The diameter is a straight line passing from side to side through the center of a circle, measuring twice the radius.

Front

What is an arc?

Back

An arc is a part of the circumference of a circle.

Front

What is a major arc?

Back

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

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by a diameter and the arc connecting its endpoints.

Front

What is a radius?

Back

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

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.