Triangle, 3 sides, 3 angles, obtuse, between 90 and 180 degrees, right angle, exactly 90 degrees, acute, less than 90 degrees, reflex, more than 180 degrees, isosceles, 2 equal sides, 2 equal angles, equilateral, 3 equal sides, 3 equal angles, scalene, no equal sides or angles, angles, are measured in degrees, protractor, used for measuring angles.

Match-Up Angles

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