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A circle is inscribed in quadrilateral ABCD, touching all four sides. If AB = 6 cm, BC = 7 cm and CD = 4 cm, find the length of AD.
- 3 cm
- 4 cm
- 5 cm
- 6 cm
Correct answer: 3 cm
Solution
Tangents from each vertex are equal, leading to the Pitot relation AB + CD = BC + AD.
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