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A transformation in which a geometric figure is reflected across a line, creating a mirror image. That line is called the axis of reflection.

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Three or more points , , , ..., are said to be collinear if they lie on a single straight line.

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A line meeting another at a right angle, or 90°.

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The common endpoint of two or more rays or line segments.

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A vector, as defined below, is a specific mathematical structure.

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The line that divides something into two equal parts. You can bisect line segments, angles, and more. Angle Bisector Construction.

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An angle whose measure is greater than 90° and less than 180°.

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the quality of being made up of exactly similar parts facing each other or around an axis.

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(of a bad, difficult, or unwelcome situation or phenomenon) present or experienced to a severe or intense degree.

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A linear pair of angles is formed when two lines intersect.

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In logic, and especially in its applications to mathematics and philosophy, a counterexample is an exception to a proposed general rule or law.

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a general proposition not self-evident but proved by a chain of reasoning; a truth established by means of accepted truths

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(of lines, planes, surfaces, or objects) side by side and having the same distance continuously between them.

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the process of translating words or text from one language into another.

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the action of rotating around an axis or center.

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The inverse image or preimage of a particular subset S of the codomain of a function is the set of all elements of the domain that map to the members of S.

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. A rigid motion of the plane ( or an isometry ) is amotion which preserves distance

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either of two angles whose sum is 180°.

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combining in such a way as to enhance or emphasize the qualities of each other or another.

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thorough or dramatic change in form or appearance.

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the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.

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the exact middle point.