Vertical Angles

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

If two lines intersect, how many pairs of vertical angles are formed?

Back

Two pairs of vertical angles are formed when two lines intersect.

Front

What is the relationship between vertical angles?

Back

Vertical angles are congruent, meaning they have the same measure.

Front

If m∠1 = 60°, what is m∠2 if ∠1 and ∠2 are vertical angles?

Back

m∠2 = 60°.

Front

What is the measure of vertical angles if one angle measures 45°?

Back

The other vertical angle also measures 45°.

Front

Name the angle formed by lines AB and CD in long form if they intersect at point E.

Back

∠ABE or ∠CED (depending on the specific angles being referred to).

Front

If m∠A = 30°, what is m∠B if ∠A and ∠B are vertical angles?

Back

m∠B = 30°.

Front

What is the sum of the measures of two adjacent angles formed by intersecting lines?

Back

The sum of the measures of two adjacent angles is 180°.

Front

If m∠3 = 120°, what is m∠4 if ∠3 and ∠4 are vertical angles?

Back

m∠4 = 120°.

Front

How do you identify vertical angles in a diagram?

Back

Vertical angles are located across from each other at the intersection of two lines.