Geometry Module 1 Vocabulary

The common endpoint of an angle.

• Vertex
• Acute
• Obtuse
• Image

Two angles whose measures have a sum of 90°

• Supplementary
• Linear
• Complementary
• Obtuse

Points that lie in the same plane

• Copilots
• Collinear
• Coplanar
• Complementary

A line, ray, or segment that divides a segment into two congruent segments.

• Segment Bisector
• Midpoint
• Angle Bisector
• Apple Pie

An angle that measures greater than 90° and less than 180°.

• Acute Angle
• Right Angle 
• Straight Angle
• Obtuse Angle

The original figure in a transformation.

• Preimage
• Image

A ray that divides an angle into two congruent angles.

• Segment Bisector
• Midpoint
• Angle Bisector
• Sunshine

Points that lie on the same line.

• Midpoint
• Coplanar
• Complementary
• Collinear

Two angles whose measures have a sum of 180°

• Supplementary
• Complementary
• Linear
• Circle

A part of a line consisting of two endpoints and all points between them.

• Line
• Line Segment
• Plane
• Point