1) Acute Angle 2) An angle that measures 0°-89° 3) Obtuse Angle 4) An angle that measures 91°-179° 5) Right Angle 6) An angle that measures exactly 90° 7) Straight Angle 8) An angle that measures exactly 180° 9) Complementary Angles 10) Two angles sum up to 90° 11) Supplementary Angles 12) Two angles sum up to 180° 13) Parallel Lines 14) Two lines that do not intersect and will never meet 15) Perpendicular Lines 16) Two lines that intersected and formed a right angle or 90° 17) Adjacent Angles 18) Two angles with a common vertex have a common side but no common interior point. 19) Vertical Angles 20) Two opposite angles when lines intersect, it is also called congruent angles 21) Linear Pair 22) Two angles that are adjacent, supplementary, and their non-common sides are opposite rays. 23) You and your right side are adjacent angles. You are ∠1 24) You are ∠2 25) You and your upper side are adjacent angles. You are ∠4 26) You are ∠3 27) You and your right side are adjacent angles. You are ∠6 28) You are ∠5 29) You and your upper side are adjacent angles. You are ∠7 30) You are ∠8 31) You and your pair are vertical angles. You are ∠a 32) You are ∠e 33) You and your pair are vertical angles. You are ∠b 34) You are ∠f 35) You and your pair are vertical angles. You are ∠c 36) You are ∠g

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