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Angles larger than a right angle and smaller than a straight angle (between 90° and 180°) are called obtuse angles ("obtuse" meaning "blunt"). An angle equal to 12 turn (180° or π radians) is called a straight angle.
3 main angles: Right; a right angle is 90 degrees, Obtuse; blunt more then 90 and less then 180, Acute: Less then 90.
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