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Geometry Jill Robertson a b a c Angles in a triangle up to 180° a b b d c Angles in a quadrilateral up to 360° e c Angles on a straight line add up to 180° d a .c b Angles round a point add up to 360° Isosceles triangles have two sides the same and two angles the same b a a b Where any two straight lines cross, the opposite angles will be equal In any Polygon, the sum of the exterior angles is 360° The sum of the interior angles is (n – 2) x 180° (n is the number of sides) These angles add up to 1800 They have various names •Supplementary angles which just means they add up to 1800 •Allied angles •Angles in the trapezium CIG = 1100 B 300 BCI = 800 I 700 A 800 D C 1100 700 1000 H G E F 1100 K Calculate AIG BIC IBC CFE FGK J
