Geometry Vocabulary

Continuous in one direction

• line

• point

• ray

• segment

points on the same line

• Supplementary

• complementary

• collinear

• vertical

The set of all points that lie equidistant from a given point called the center

• radius

• diameter

• arc

• circle

Line segment from the center to any point on the circle

• radius

• diameter

• arc

• chord

line segment with both endpoints on the circle

• radius

• diameter

• arc

• chord

line segment with both endpoints on the circle and passing through the center of the circle

• radius

• diameter

• arc

• chord

Formed by two rays at the common point

• angle

• vertex

• circle

• triangle

Measuring between 0 and 90 degrees

• acute angle

• obtuse angle

• right angle

• straight angle

• reflex angle

measuring between 90 and 180 degrees

• acute angle

• obtuse angle

• right angle

• straight angle

• reflex angle

measuring exactly 90 degrees

• acute angle

• obtuse angle

• right angle

• straight angle

• reflex angle