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36 Cards in this Set
 Front
 Back
An angle whose measure is less than 90 degrees

Acute Angle


A figure formed by two rays with a common endpoint

angle


A ray that divides an angle into two congruent angles

Angle bisector


The center of a circumscribed triangle. It is the point where the three perpendicular bisectors of the sides of the triangle intersect.

Circumcenter


A circle that is drawn around the outside of the triangle and contains all three vertices.

Circumscribed Circle


Lying on the same line

Collinear


Two angles whose measures have a sum of 90 degrees

Complementary angles


Having the same size and shape

Congruent


A statement that is believed to be true

Conjecture


Lying in the same plane

Coplanar


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

Endpoint


A shape that results from a transformation of a figure known as the preimage

Image


The center of an inscribed circle. The point where the three angle bisectors of a triangle intersect.

Incenter


A circle inside the triangle that touches each side of the triangle at one point

Inscribed circle


To have one or more points in common

Intersect


The measure of the distance from one endpoint to the other

Length


An undefined term in geometry that is understood to be perfectly straight, contain an infinite number of points, extend indefinitely in two directions and have no thickness

Line


The two angles formed by the endpoint of a ray when the endpoint falls on a line. Two adjacent angles whose noncommon sides are opposite rays

Linear Pair


The point that divides a segment into two congruent segments

Midpoint


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

Obtuse angle


Coplanar lines or any two planes in space that do not meet, no matter how far they are extended

Parallel


A line that is perpendicular to a segment at its midpoint

Perpendicular bisector


Lines that intersect to form right angles

Perpendicular lines


An undefined term in geometry that is understood to be a flat suface that extends indefinitely in all directions

plane


An undefined term in geometry that can be thought of as a dot that represents a location in a plane or space.

Point


A statement that is accepted as true without proof

Postulate


A shape that undergoes a motion or transformation

Preimage


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

Ray


A transformation that flips the preimage over a line

Reflection


An angle with a measure of 90 degrees

Right Angle


A transformation that does not change the size or shape of a figure

Rigid transformation


A transformation in which every point of the preimage is rotated by a given angle around a point

Rotation


A part of a line that begins at a point and ends at another

Segment


A line that divides a segment into two congruent segments

Segment Bisector


Two angles whose measures have a sum of 180 degrees

Supplementary Angles


A transformation in which every point of the preimage moves in the same direction by the same distance to form the image

Translation
