Undefined Terms

Point

Line

Plane

Collinear

Coplaner

(Line) Segment

Endpoint

Ray

Opposite Rays

Postulate (axiom)

Distance

Length

Congruent Segments

Construction

Midpoint

Bisects

Segment Bisector

Angle

Vertex

Interior of an angle

Exterior of an angle

Measure

Degree

Acute Angle

Right Angle

Obtuse Angle

Straight Angle

Congruent Angles

Angle Bisector

Adjacent Angles

Linear Pair

Complementary Angles

Supplementary Angles

Vertical Angles

Coordinate Plane

Midpoint formula

Distance Formula

Legs

Hypotenuse