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Angles that are adjacent and add to 180 degrees.

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Angles that add to 90 degrees

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Angles that are opposite of each other in the center of a bisector

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Two adjacent angles that are congruent.

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Angles that are linear.

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A line that equally splits a triangle in half the is perpendicular to the opposite side of the angle its in.

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Used to find the slope of the center of a line segment.

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d=(y1-y2)+(x1-x2) squared

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The center of a line segment

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AB + BC = AC

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Point, Line, and Plane.