Lines and Angles Review

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two parallel lines.

Front

Identify a pair of alternate interior angles in a diagram with parallel lines cut by a transversal.

Back

For example, if lines are parallel and a transversal intersects them, angles ∠3 and ∠8 are alternate interior angles.

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines cut by a transversal.

Front

Identify a pair of corresponding angles in a diagram with parallel lines cut by a transversal.

Back

For example, if lines are parallel and a transversal intersects them, angles ∠1 and ∠6 are corresponding angles.

Front

What is the sum of angles on a straight line?

Back

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

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180°.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

Identify a pair of vertical angles in a diagram.

Back

For example, if two lines intersect, angles ∠1 and ∠3 are vertical angles.

Front

What is the relationship between supplementary angles?

Back

Supplementary angles are two angles that add up to 180°.