review secants tangents and angle measures

Front

What is a secant line?

Back

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

Front

What is a tangent line?

Back

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

Front

How do you find the measure of an angle formed by a tangent and a chord?

Back

The measure of the angle formed by a tangent and a chord through the point of contact is equal to half the measure of the intercepted arc.

Front

What is the relationship between the angles formed by two secants intersecting outside a circle?

Back

The measure of the angle formed by two secants intersecting outside a circle is equal to half the difference of the measures of the intercepted arcs.

Front

What is the formula for the measure of an arc?

Back

The measure of an arc is equal to the degree measure of the central angle that subtends the arc.

Front

How do you calculate the measure of a minor arc?

Back

The measure of a minor arc is equal to the measure of the central angle that subtends it.

Front

What is the measure of a major arc?

Back

The measure of a major arc is equal to 360 degrees minus the measure of the corresponding minor arc.

Front

If angle ABE is 129 degrees, what can you infer about the intercepted arc?

Back

The intercepted arc corresponding to angle ABE is also 258 degrees, as the angle is half the measure of the arc.

Front

What is the relationship between the measures of angles formed by two tangents?

Back

The measure of the angle formed by two tangents drawn from a point outside the circle is equal to half the difference of the measures of the intercepted arcs.

Front

How do you find the measure of an angle formed by two secants?

Back

The measure of the angle formed by two secants is equal to half the sum of the measures of the intercepted arcs.