Lines and Segments in Circles

Front

What is a chord?

Back

A line segment with both endpoints on the circle.

Front

What is DE?

Back

A chord.

Front

Define a central angle.

Back

An angle whose vertex is the center of the circle.

Front

What is the vocabulary/description for a line segment from the center to the circle?

Back

A radius.

Front

What is the vocabulary/description for a line that touches the circle at exactly one point?

Back

A tangent line.

Front

What is a diameter?

Back

A chord that passes through the center of the circle.

Front

What is a secant line?

Back

A line that intersects the circle at two points.

Front

What is the relationship between a radius and a diameter?

Back

The diameter is twice the length of the radius.

Front

What is the measure of a central angle in a circle?

Back

It is equal to the measure of the arc it intercepts.

Front

What is an inscribed angle?

Back

An angle whose vertex is on the circle and whose sides contain chords of the circle.