Circles, chords, and arcs

Front

What is a tangent to a circle?

Back

A tangent to a circle is a line that touches the circle at exactly one point and is perpendicular to the radius at that point.

Front

Define a chord in a circle.

Back

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

Front

What is the difference between a chord and a diameter?

Back

A diameter is a special type of chord that passes through the center of the circle and is the longest chord.

Front

What is an inscribed angle?

Back

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

Front

How is the measure of an arc related to its inscribed angle?

Back

The measure of an arc is equal to twice the measure of its corresponding inscribed angle.

Front

What are congruent arcs?

Back

Congruent arcs are arcs that have the same measure and are subtended by congruent chords.

Front

What is the relationship between congruent chords and arcs?

Back

Congruent chords subtend congruent arcs in a circle.

Front

What is a secant line?

Back

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

Front

What is the measure of a central angle?

Back

The measure of a central angle is equal to the measure of the arc it intercepts.

Front

What is the formula for the circumference of a circle?

Back

The circumference of a circle is given by the formula C = 2πr, where r is the radius.