Cheatography
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Terms
Acute Angle |
Less than 90° |
Adjacent Angle |
Two angles on the same plane |
Collinear Points |
Two points on the same line |
Complementary Angle |
Two angles whose sum is 90° |
Midpoint |
The point halfway between the endpoints of a segment. |
Obtuse Angle |
More than 180° |
Ray |
A point on a line and all points in one direction |
Vertical Angles |
Two nonadjacent angles formed by two intersecting lines |
Linear Pair |
Adjacent angles whose non-common sides are opposite rays |
Isoscles |
At least two sides are congruent |
Scalene |
Nothing is congruent |
Equilateral |
Every side is the same length |
Biconditional |
A and B are bi conditionally related if A implies B and B implies A. |
Counterexample |
a number which disproves a proposition For example, the prime number 2 is a counterexample to the statement "All prime numbers are odd." |
Isometry |
A isometry is a transformation where distance (aka size) is preserved. |
Preimage |
Produced by reflection from a mirror, refraction by a lens, or the passage of luminous rays through a small aperture and their reception on a surface. |
Translation |
A transformation in which a graph or geometric figure is picked up and moved to another location without any change in size or orientation. |
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