Angle Pair Relationships with Algebra Expressions

Front

What are parallel lines?

Back

Lines that never intersect and are always the same distance apart.

Front

What is a transversal?

Back

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

Front

What are corresponding angles?

Back

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

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines; they are equal if the lines are parallel.

Front

What are same-side interior angles?

Back

Angles that are on the same side of the transversal and inside the two lines; they are supplementary if the lines are parallel.

Front

How do you prove that two lines are parallel using angle relationships?

Back

If corresponding angles are equal or if alternate interior angles are equal, then the lines are parallel.

Front

What is the sum of the angles in a triangle?

Back

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

Front

If angle 2 = 36 degrees, what is angle 1 if they are supplementary?

Back

Angle 1 = 180 - 36 = 144 degrees.

Front

What is the relationship between same-side interior angles?

Back

Same-side interior angles are supplementary, meaning they add up to 180 degrees.

Front

If two angles are complementary, what is their sum?

Back

The sum of complementary angles is 90 degrees.