Unit 10 Vocabulary

Front

What is the definition of a circle?

Back

A circle is the set of points equidistant from a given point, known as the center.

Front

What is a tangent line in relation to a circle?

Back

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

Front

What is the center of a circle?

Back

The center of a circle is the point from which all points on the circle are equidistant.

Front

What is a radius in a circle?

Back

A radius is a segment with endpoints at the center of the circle and any point on the circle.

Front

What is an arc in a circle?

Back

An arc is a portion of the edge of the circle defined by two endpoints.

Front

What is the diameter of a circle?

Back

The diameter is a segment that passes through the center of the circle and has endpoints on the circle, and it is twice the length of the radius.

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 a chord in a circle?

Back

A chord is a segment whose endpoints lie on the circle.

Front

What is the relationship between the radius and diameter?

Back

The diameter is twice the length of the radius (d = 2r).

Front

What is a sector of a circle?

Back

A sector is a region of a circle bounded by two radii and the arc between them.