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TermsAcute 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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