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,

Angles and Lines

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