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36 Cards in this Set
- Front
- Back
An angle whose measure is less than 90 degrees
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Acute Angle
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A figure formed by two rays with a common endpoint
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angle
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A ray that divides an angle into two congruent angles
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Angle bisector
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The center of a circumscribed triangle. It is the point where the three perpendicular bisectors of the sides of the triangle intersect.
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Circumcenter
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A circle that is drawn around the outside of the triangle and contains all three vertices.
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Circumscribed Circle
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Lying on the same line
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Collinear
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Two angles whose measures have a sum of 90 degrees
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Complementary angles
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Having the same size and shape
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Congruent
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A statement that is believed to be true
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Conjecture
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Lying in the same plane
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Coplanar
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The point at the end of a segment or the starting point of a ray
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Endpoint
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A shape that results from a transformation of a figure known as the preimage
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Image
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The center of an inscribed circle. The point where the three angle bisectors of a triangle intersect.
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Incenter
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A circle inside the triangle that touches each side of the triangle at one point
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Inscribed circle
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To have one or more points in common
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Intersect
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The measure of the distance from one endpoint to the other
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Length
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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
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Line
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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
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Linear Pair
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The point that divides a segment into two congruent segments
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Midpoint
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An angle whose measure is greater than 90 degrees, but less than 180 degrees
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Obtuse angle
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Coplanar lines or any two planes in space that do not meet, no matter how far they are extended
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Parallel
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A line that is perpendicular to a segment at its midpoint
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Perpendicular bisector
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Lines that intersect to form right angles
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Perpendicular lines
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An undefined term in geometry that is understood to be a flat suface that extends indefinitely in all directions
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plane
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An undefined term in geometry that can be thought of as a dot that represents a location in a plane or space.
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Point
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A statement that is accepted as true without proof
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Postulate
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A shape that undergoes a motion or transformation
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Preimage
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A part of a line that starts at a point and extends indefinitely in one direction
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Ray
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A transformation that flips the preimage over a line
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Reflection
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An angle with a measure of 90 degrees
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Right Angle
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A transformation that does not change the size or shape of a figure
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Rigid transformation
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A transformation in which every point of the preimage is rotated by a given angle around a point
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Rotation
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A part of a line that begins at a point and ends at another
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Segment
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A line that divides a segment into two congruent segments
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Segment Bisector
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Two angles whose measures have a sum of 180 degrees
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Supplementary Angles
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A transformation in which every point of the preimage moves in the same direction by the same distance to form the image
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Translation
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