Basic Geometry Terms

An angle with measure equal to 180°

• Straight angle

• Supplementary angle

• Linear pair

• Obtuse angle

Two angles whose measures have the sum 180°

• Complentary angles

• Supplementary angles

• Obtuse angle

• Straight angle

Two angles whose sides form two pairs of opposite rays

• Vertical angles

• Adjacent angles

• Straight angle

• Linear Pair

An angle with measure between 0° and 90°

• Acute angle

• Complementary angle

• Right angle

• Adjacent angle

The point where two rays, segments, etc. come together

• Midpoint

• Ray

• Vertex

• Intersection

Two angles that share a common vertex and side, but have no common interior points

• Supplementary angles

• Complementary angles

• Adjacent angles

• Vertical angles

A ray or segment that divides something into two parts that are congruent

• Bisector

• Vertex

• Midpoint

• Intersection

Points that lie on the same line

• Coplanar points

• Noncollinear points

• Collinear points

• Noncoplanar points

Two angles whose measures have the sum 90°

• Complementary angles

• Right angle

• Supplementary angles

• Adjacent angles

Angles that have the same measure

• Complementary angles

• Supplementary angles

• Adjacent angles

• Congruent angles