Triangle Angle-Sum and Exterior Angle Theorem Review + // Lines

Front

What is the Triangle Angle-Sum Theorem?

Back

The Triangle Angle-Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

What is the Exterior Angle Theorem?

Back

The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

If two lines are parallel, what can be said about the corresponding angles?

Back

If two lines are parallel, the corresponding angles are equal.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of the transversal and inside the two lines. If the lines are parallel, these angles are equal.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

How do you find the measure of an angle using the Triangle Angle-Sum Theorem?

Back

To find the measure of an angle in a triangle, subtract the sum of the other two angles from 180 degrees.

Front

What is the relationship between exterior angles and interior angles in a triangle?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

If two parallel lines are cut by a transversal, what can be said about the alternate exterior angles?

Back

If two parallel lines are cut by a transversal, the alternate exterior angles are equal.

Front

What is the value of x if the angles in a triangle are 60 degrees and 106 degrees?

Back

x = 180 - (60 + 106) = 14 degrees.

Front

If angle A and angle B are vertical angles, what can be said about their measures?

Back

Angle A and angle B are equal in measure.