Circles, Arcs, and Inscribed Angles

Front

What is a secant line?

Back

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

Front

What is a chord in a circle?

Back

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

Front

What is a tangent line?

Back

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

Front

What is the diameter of a circle?

Back

The diameter is a chord that passes through the center of the circle and is the longest chord.

Front

What is an arc in a circle?

Back

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

Front

How do you find the measure of an inscribed angle?

Back

The measure of an inscribed angle is half the measure of the intercepted arc.

Front

What is the relationship between a central angle and an inscribed angle that intercept the same arc?

Back

The central angle is twice the measure of the inscribed angle.

Front

If two chords intersect inside a circle, how do you find the measure of the angles formed?

Back

The measure of each angle is half the sum of the measures of the arcs intercepted by the angle and its vertical angle.

Front

What is the formula for the circumference of a circle?

Back

The circumference C is given by C = πd, where d is the diameter.

Front

What is the formula for the area of a circle?

Back

The area A is given by A = πr², where r is the radius.