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A quadrilateral ABCD is inscribed in a circle. The sides AB and DC are extended to meet at point M outside the circle with BM = 9 cm, MC = 12 cm and MD = 30 cm. What is the value of side AB of quadrilateral ABCD?

A quadrilateral ABCD is inscribed in a circle. The sides AB and DC are extended to meet at point M outside the circle with BM = 9 cm, MC = 12 cm and MD = 30 cm. What is the value of side AB of quadrilateral ABCD? Correct Answer 31 cm

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