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 around a point - add to 360 degrees, angles in a triangle - add to 180 degrees, angles - are measured in degrees, angles in a quadrilateral - add up to 360 degrees,

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