Corresponding angles, Angles that add up to 90º (right angle). - Complementary angles, Alternate angles, Angles that add up to 180º (a straight line). - Supplementary angles, Equilateral triangle , More than 180º but less than 360º - Reflex angle, Isosceles triangle, Angle that is less than 90º - Acute angle, Quadrilateral , Angle that is greater than 90º but smaller than 180º. - Obtuse angle, Trapezium - One pair of parallel opposite sides, Parallelogram, Rhombus, Kite,

Lesson 17: Angles, Triangles and Polygons

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