##### Geometry Terminology

Point

has no size; length, width, or height. It is represented by a dot and named by a capital letter

Line

set of points which has infinite length but no width or height. A line is named by a lower case letter or by any two points on the line

Plane

set of points that has infinite length and width but no height. We name a plane with a capital letter

Collinear Points

points that lie on the same line

Noncollinear points

points that do not lie on the same plane

Segment

part of a line that consists of two points called endpoints and all points between them

Ray

is the part of a line that contains an endpoint and all points extending in the other direction

Acute Angle

angle whose measure is between 0 degrees and 90 degrees

Right Angle

angle whose measure is 90 degrees

Obtuse Angle

angle whose measure is greater than 90 degrees but less than 180 degrees

Straight Angle

angle whose measure is 180 degrees