Explore Angle Relationships and Triangle Properties

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of a transversal and inside the two parallel lines. They are equal in measure.

Front

What is the measure of angles on a straight line?

Back

The sum of the measures of angles on a straight line is 180°.

Front

What are vertical angles?

Back

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

Front

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

Back

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

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

Front

How do you find the measure of a missing angle in a triangle?

Back

To find the measure of a missing angle in a triangle, subtract the sum of the known angles from 180°.

Front

What is a transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

What is the relationship between corresponding angles?

Back

Corresponding angles are equal when a transversal intersects two parallel lines.

Front

What are exterior angles?

Back

Exterior angles are the angles formed outside of a polygon when one side is extended.