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Teacher's Notes Topic: Angles, Proof, Algebra Rhombus L7 The diagram shows a rhombus. The midpoints of two of its sides are joined with a straight line. What is the size of angle p ? Solve the original problem, then ... Change 110° - make it bigger ? - make it smaller ? Relabel the 110° angle as x. What if x = 120° ? x = 140° ? Can you work out algebra to link x and p? What if x is 90° ? What if x is 180° ? Rhombus The diagram shows a rhombus. The midpoints of two of its sides are joined with a straight line. What is the size of angle p ?
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