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Quadrilateral `ABCD` is circumscribed to a circle. If `AB=6cm`, `BC=7cm` and `CD=4cm` then the length of `AD` is

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Quadrilateral `ABCD` is circumscribed to a circle. If `AB=6cm`, `BC=7cm` and `CD=4cm` then the length of `AD` is
A. `3cm`
B. `4cm`
C. `6cm`
D. `7cm`
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1 Answer

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Best answer
`AB+CD=AD+BC`
`impliesAD=AB+CD-BC=(6+4-7)cm=3cm`
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