Calculate Angles in Triangles

Front

What are vertical angles?

Back

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

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a straight line crosses two others.

Front

What does the Triangle Sum Theorem state?

Back

The Triangle Sum Theorem states that the sum of all angles in a triangle is 180 degrees.

Front

If one angle in a triangle measures 50 degrees, what is the sum of the other two angles?

Back

The sum of the other two angles is 130 degrees.

Front

What are complementary angles?

Back

Complementary angles are two angles whose sum is 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose sum is 180 degrees.

Front

What are alternate interior angles?

Back

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

Front

What are consecutive interior angles?

Back

Consecutive interior angles are pairs of angles that lie on the same side of the transversal and inside the two lines.

Front

If ∠1 and ∠2 are supplementary and ∠1 measures 70 degrees, what is the measure of ∠2?

Back

The measure of ∠2 is 110 degrees.

Front

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

Back

If two angles are vertical angles, their measures are equal.