17(a)Angles Polygons SymmetryEasy1 markTwo of the angles in a triangle are 100∘ and 30∘.Work out the size of the third angle.Answer∘Grade answerSolutionGrading criteria
17(b)Angles Polygons SymmetryEasy2 marksWork out the size of an interior angle of a regular 10-sided polygon.Answer∘Grade answerSolutionGrading criteria