Intro to Geometry Proofs

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are two lines that intersect at a right angle (90 degrees).

Front

What does the Segment Addition Postulate state?

Back

If point X is between points R and T on a line, then RX + XT = RT.

Front

What is the definition of congruent angles?

Back

Congruent angles are angles that have the same measure.

Front

What does the Angle Addition Postulate state?

Back

If A is in the interior of angle BDC, then m∠BDA + m∠ADC = m∠BDC.

Front

What is the Reflexive Property?

Back

The Reflexive Property states that any quantity is equal to itself (e.g., a = a).

Front

What is the definition of a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is the definition of a midpoint?

Back

A midpoint is a point that divides a segment into two equal parts.

Front

What is the Transitive Property?

Back

The Transitive Property states that if a = b and b = c, then a = c.

Front

What is the definition of vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect; they are always congruent.

Front

What is the definition of an angle?

Back

An angle is formed by two rays with a common endpoint called the vertex.