3 or more points that lie on a singular straight line.

(a)  

Points that do not lie in the same line

(a)  

Parts of a line. It has two endpoints.

(a)  

A point that is the middle of a line segment.

(a)  

Part of a line with exactly one endpoint. It is named by the endpoint first.

(a)  

A series of points that extend in opposite directions without end.

(a)  

Lines that lie in the same area that intersect

(a)  

Lines that lie in the same area that do NOT intersect.

(a)  

Two lines that intersect that for a right angle.

(a)  

Lines that lie in different planes so they never intersect.

(a)  

A flat, two dimensional surface that extends infinetly.

(a)  

What forms when two rays have a common endpoint.

(a)  

The common endpoint of an angle.

(a)  

The two rays that form an angle are also known as the (a)   of an angle.

An angle that measures between 1 and 90 degrees.

(a)  

An angle that measures between 90 and 180 degrees.

(a)  

An angle that measures exactly 90 degrees.

(a)  

An angle that measures exactly 180 degrees.

(a)  

A pair of angles whose sum is 90 degrees. They do not need to be adjacent.

(a)  

A pair of angles whose sum is a 100 degrees. They do not need to be adjacent.

(a)  

Angles that share a vertex and a side.

(a)  

A tool used to measure angles

(a)  

Equal in size and shape

(a)  

The tick marks on the sides or angles that have the same measure.

(a)  

Angles that have the same measure

(a)  

Segments that have the same measure

(a)  

A two dimensional shape formed by a minimum of 3 straight line segments.

(a)  

A polygon with all sides AND angles congruent.

(a)  

A polygon with 3 sides.

(a)  

A triangle with all acute angles.

(a)  

A triangle with one obtuse angle.

(a)  

A triangle with one right angle.

(a)  

A triangle with no congruent sides

(a)  

A triangle with three congruent sides.

(a)  

A polygon with four sides.

(a)