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The lengths of three consecutive sides of a quadrilateral circumscribing a circle are 4 cm, 5 cm and 7 cm respectively.

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The lengths of three consecutive sides of a quadrilateral circumscribing a circle are 4 cm, 5 cm and 7 cm respectively. Determine the length of the fourth side.

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Given

AB = 7, BC = 5, CD = 4

Length of the tangent drawn from an external point to the circle are equal

Therefore

AB = CD = BC + AD

7 + 4 = 5 + AD

AD = 11 - 5 = 6

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