vertically, _______ opposite angles are equal, corresponding, 'F' angles, alternate, 'Z' angles, parallel, like train tracks, interior, angles on the inside, exterior, angles on the outside, supplementary, angles that add to 180o, acute, an angle between 0o and 90o, obtuse, an angle between 90o and 180o, reflex, an angle between 180o and 360o, protractor, the instrument that we use to measure angles

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