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A circle touches all four sides of a quadrilateral ABCD with AB = 6, BC = 7, CD = 4. Then AD equals
A4
B3
C5
D8
Answer & Solution
Correct answer: B. 3
1. For a tangential quadrilateral: AB + CD = BC + AD.
2. 6 + 4 = 7 + AD.
3. AD = 3.
_Source: NCERT Class 10 Mathematics, Ch 10 "Circles", §10.3_
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