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"Adjacent Angles" Adjacent angles are adjacent when they have a common side and a common vertex. Adjacent angles do not overlap.
"Congruent Angles" They have the same angle in degrees or radian.
"Complementary Angles" These are angles that add up to 90 degrees.
"Vertical Angles" Angles that are opposite of each-other. These are formed by intersecting lines.
"Perpendicular Lines" Lines that are at right angles (90°) to each other.
"Supplementary Angles" Two angles that add up to 180 degrees.
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