5.1 - Parts of the Circle

Front

What is the diameter of a circle?

Back

The diameter is a straight line that passes through the center of the circle and connects two points on its circumference. It is twice the length of the radius.

Front

What is a radius in a circle?

Back

The radius is a line segment from the center of the circle to any point on its circumference. It is half the length of the diameter.

Front

Define circumference.

Back

Circumference is the distance around the circle, or the perimeter of the circle.

Front

What is a chord in a circle?

Back

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

Front

What is a tangent line?

Back

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

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 that extend to the circumference.

Front

Define inscribed angle.

Back

An inscribed angle is an angle formed by two chords in a circle which have a common endpoint.

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.

Front

What is a segment of a circle?

Back

A segment is a region of a circle that is bounded by a chord and the arc connecting the endpoints of the chord.

Front

What is a minor arc?

Back

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