Angles and Linear Equations

Front

What are supplementary angles?

Back

Angles that add up to 180°

Front

What are complementary angles?

Back

Angles that add up to 90°

Front

What is a linear pair of angles?

Back

A pair of adjacent angles that are formed when two lines intersect and are supplementary.

Front

What is the sum of angles on a straight line?

Back

180°

Front

What is the sum of angles in a triangle?

Back

180°

Front

If one angle is 43°, what is the measure of its supplementary angle?

Back

137°

Front

If two angles are equal, what type of angles are they?

Back

They are called congruent angles.

Front

What is the value of x if the angles are 90° and x?

Back

x = 90° (complementary angles) or x = 0° (if they are the same angle) depending on context.

Front

What is the value of x if the angles are 80° and x?

Back

x = 100° (supplementary angles) or x = 80° (if they are the same angle) depending on context.

Front

What is the definition of vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.