Circle Vocabulary

Front

What is a diameter?

Back

A diameter is a special chord that passes through the center of a circle, dividing it into two equal halves.

Front

What is a chord?

Back

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

Front

What is a secant?

Back

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

Front

What is an arc?

Back

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

Front

What is a minor arc?

Back

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

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 an arc that represents half of a 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 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 relationship between a chord and a radius?

Back

A chord is never a radius; a radius connects the center of the circle to a point on the circle.