Acute angles, less than 90°, Obtuse angle, more than 90° but less than 180°, Right angle, equal to 90°, Reflex angle, more than 270° but less than 360°, Angle on a straight line, equal to 180°, Angles in a triangle, add up to 180°, An isosceles triangle , has 2 sides of equal length, Angles of a quadrilateral , will add up to 360°.

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