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33 Cards in this Set
- Front
- Back
Acute Angle
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an angle whose measure is less than 90 degrees
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Angle
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a figure formed by two rays with a common endpoint
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Angle Bisector
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a line or ray that divides an angle into two congruent angles
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Center of Rotation
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the point that every other point moves around in a rotation
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Collinear Points
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a single line can contain them all
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Complementary Angles
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two angles whose measures have a sum of 90 degrees
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Conjecture
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a statement that you think is true- an "educated guess"
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Coordinate Plane
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a plane on a coordinate grid
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Coplanar
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a single plane can contain them all
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Endpoints
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the location where a line/ray begins/ends
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Glide Reflection
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a type of composite transformation where a figure is reflected and then translated in a parallel direction
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Image
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a shape that has undergone a motion or transformation
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Line
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has no thickness, is perfectly straight and extends forever
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Line Segment
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part of a line that begins at one point and ends at the other
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Linear Pair
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if two angles form this, they are supplementary
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Midpoint of a Segment
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the point where a bisector intersects a segment
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Obtuse Angle
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an angle whose measure is greater than 90 degrees and less than 180 degrees
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Parallel Lines
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two coplanar lines that do not intersect
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Perpendicular Lines
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two lines that intersect to form a right angle
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Plane
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geometric figure that extends infinitely in all directions along a flat surface
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Point
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often shown as dots, represent location and have no size
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Postulate
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statements that are accepted as true without proof
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Pre-image
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a shape that undergoes a motion or transformation
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Ray
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a part of a line that starts at one point and extends infinitely in one direction
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Reflection
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geometric figures are flipped across a line, which plays the role of a mirror
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Right Angle
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an angle whose measure is 90 degrees
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Rigid Transformation
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Transformation that does not change the size or shape of a figure
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Rotation
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every point of a figure moves around a given point
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Segment Bisector
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a line that divides a segment into two congruent parts
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Supplementary Angles
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two angles whose measures have a sum of 180 degrees
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Transformation
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mathematical motion
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Translation
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every point of a figure moves in a straight line, and all points move the same distance and in the same direction
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Undefined Terms
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the building blocks of geometry - lines, planes and points
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