Ruler Postulate

The distance given between any two points is given by:

Segment Addition Postulate

For collinear points A, B, and C, with B between A and C, AB+BC=AC

Congruent Segments

• congruent segments have equal measure

Definition: Midpoint

A midpoint of a segment divides the segment into two congruent pieces. A midpoint bisects the segment.

Definition: Angle

An angle is two rays with the same endpoint. MUST use three points to name if more than one angle on vertex.

Angle Addition Postulate

m<1 + m<2 = m

m<1 + m<2 = 180

Recall From Pre-Algebra:

• Vertical angles are congruent
• full circle=360

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Further Reading

• Geometry Help: Points, Lines, and Planes
• Geometry Help: Segments, Rays, Parallel Lines, and Planes
• Geometry Help: Conditional Statements
• Geometry Help: Biconditionals and Definitions