Acute Angle, An angle measuring less than 90°, Right Angle, An angle measuring exactly 90°, Straight Angle, An angle measuring exactly 180°, Linear Pair, Two adjacent angles that form a straight line, Complementary Angles, Angles whose measures add to 90°, Supplementary Angles, Angles whose measures add to 180°, Vertical Angles, Opposite angles formed by intersecting lines that are congruent., Adjacent Angles, Two angles having the same vertex and share a side., Congruent Angles, Angles that have the same measure., Obtuse Angle, An angle measuring more than 90°, Parallel Lines, Straight lines on the same plane that stay the same distance apart and never intersect., Perpendicular Lines, Two straight lines that intersect at 90°

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