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either of two angles whose sum is 180°.

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either of two angles whose sum is 90°.

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each of the pairs of opposite angles made by two intersecting lines.

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

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Adjacent angles are two angles that have a common vertex and a common side.

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"the midpoint of the line segment"

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These words are point, line and plane, and are referred to as the "three undefined terms of geometry".