4.1 Finding Angle Measurements

Front

What are Vertical Angles?

Back

Vertical angles are angles that are opposite each other when two lines intersect. They are always congruent (equal in measure).

Front

What is the sum of angles in a triangle?

Back

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

Front

What are Supplementary Angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What are Complementary Angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

Find the missing angle if one angle is 70 degrees. What is the other angle if they are supplementary?

Back

The other angle is 110 degrees.

Front

Find the missing angle if one angle is 28 degrees. What is the other angle if they are complementary?

Back

The other angle is 62 degrees.

Front

What is the definition of Alternate Interior Angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of the transversal and inside the two lines.

Front

If two angles are vertical angles, what can we say about their measures?

Back

Vertical angles are always congruent (equal in measure).

Front

Find x if the angles are supplementary: x + 130 degrees = 180 degrees.

Back

x = 50 degrees.

Front

What is the relationship between Corresponding Angles?

Back

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