Unknown Angle Vocab and Proofs Review

Front

The sum of the angles in a triangle is _____

Back

180 degrees

Front

What is the justification (reason) for identifying a midpoint?

Back

Definition of a midpoint

Front

If 2 angles sum to 180 degrees, the angles are _______.

Back

Supplementary

Front

Solve for x: 2x + 6 = 14

Back

4

Front

If m<1 + m<2 = 50 and m<2 = 10, then m<1 + 10 = 50. What property is used?

Back

Substitution

Front

What do you call angles that add up to 90 degrees?

Back

Complementary angles

Front

What is the property that states if a = b, then b can be substituted for a in any expression?

Back

Substitution property

Front

What is the term for a line that divides another line segment into two equal parts?

Back

Segment bisector

Front

What is the definition of a linear pair?

Back

Two adjacent angles that are supplementary.

Front

What is the reflexive property of equality?

Back

For any number a, a = a.