Holt Geometry - Chapter 1 Vocabulary

A unit of measure for angles

• midpoint

• point

• degree

• ray

Two or more points that lie on the same line

• collinear

• linear pair

• sides

• image

A dot which represent a location in space

• ray

• image

• point

• vertex

Two angles whose measures have a sum of 90 degrees

• supplementary

• complementary

• linear pair

• acute angle

An angle whose measure is less than 90 degrees

• obtuse

• perpendicular

• right

• acute

Lines that intersect to form right angles

• parallel

• perpendicular

• linear pair

• supplementary

Angles or segments that have the same measure

• complementary

• parallel

• reflection

• congruent

An angle whose measure is 90 degrees

• right

• acute

• parallel

• obtuse

A pair of adjacent angles that form a straight line whose angle sum is 180 degrees

• angle measure

• reflection

• linear pair

• rotation

A part of a 'line' that has one endpoint and extends infinitely in the other direction

• postulate

• ray

• image

• reflection