Protractor, used for measuring angles, Obtuse Angle, between 90 and 180 degrees, Right Angle, exactly 90 degrees, Acute Angle, less than 90 degrees, Reflex Angle, more than 180 degrees, Angles, are measured in degrees, Vertical Line, line doing directly upwards, Horizontal Line, line parallel to the ground, Parallel Lines, lines which never meet, Perpendicular Lines, lines at an angle of 90 degrees from each other, Straight Angle, angle of 180 degrees.

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