Which of the following statements is not true? O The Cosine Rule expresses a relationship between all sides of a triangle and any one of the angles. The Sine Rule expresses a relationship between the lengths of any two sides of a triangle and their opposite angles. Pythagoras's Theorem only holds for right-angled triangles. O The Cosine Rule holds for all triangles. O The Sine Rule only holds for right-angled triangles.

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