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### 36 Cards in this Set

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• 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