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20 Cards in this Set
 Front
 Back
Midpoint

The point that divides a segment into two congruent segments


Supplementary Angles

Two angles whose measures have a sum of 180


Segment Bisector

A line that divides a segment into two congruent segments


Acute Angle

An angle whose measure is less than 90


Angle Bisector

A ray that divides an angle into two congruent angles


Linear Pair

the two angles formed by the endpoint of a ray when the endpoint falls on a line; tow adjacent angles whose noncommon sides are opposite rays; two supplementary angles that reside on a line


Right Angle

An angle with a measure of 90


Complementary angles

Two angles whose measure have a sum of 90


Perpendicular

Lines intercept to form right angles


Obtuse Angle

An angle whose meausure is greater than 90 and less than 180


Perpendicular Bisector

A line that is perpendicular to a segment at its midpoint


Coplanar

Lying in the same plane


Ray

A part of a line that starts at a point and extends infedentely in one direction


Endpoints

A point at the end of a segment or the starting of a ray


Postulate

A statement that is accepted true without proof


Concurrent Lines

litterally "running together; of three of more lines interacting at a single point


Segment

A part of a line that begins at one point and ends at another; a segment of a line has two endpoints


Congruent

The relationship between figures having the same size and shape; congruent segments are segments that match exactly


Undefined Terms

Point, Lines, and Plane; because they are so basic they are not defined by other figures


Vertex

A point where the edges of a figure intercect; plural  vertices
