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, formed by two rays, angle.

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