3: Lines & Angle Relationships

Front

What are lines that never intersect called?

Back

Parallel lines.

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What is the Triangle Sum Theorem?

Back

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

Front

What are remote interior angles?

Back

Angles that are not adjacent to a given exterior angle but are inside the triangle.

Front

If two angles are vertical angles, what is true about their measures?

Back

They are equal.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.