8th grade Unit 6 Angle Relationships

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

If two angles in a triangle measure 47˚ and 68˚, how do you find the third angle?

Back

Subtract the sum of the two angles from 180 degrees: 180 - (47 + 68) = 65 degrees.

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on different parallel lines cut by a transversal.

Front

If angle 1 measures 47˚, what is the measure of angle 8 if they are equal?

Back

Angle 8 also measures 47˚.

Front

What is the measure of an angle if it is supplementary to a 120˚ angle?

Back

The measure of the angle is 60 degrees, since supplementary angles add up to 180 degrees.

Front

What is the measure of an angle if it is complementary to a 70˚ angle?

Back

The measure of the angle is 20 degrees, since complementary angles add up to 90 degrees.

Front

How do you find the value of x in a triangle if you know the other two angles?

Back

Use the formula: x = 180 - (angle1 + angle2).

Front

What is the definition of vertical angles?

Back

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

Front

If two angles are equal, what can you say about their measures?

Back

Their measures are the same.

Front

What is the relationship between alternate interior angles?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.