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A quadrilateral ABCD is drawn to circumscribe a circle (see Fig. 10.12). Prove that AB + CD = AD + BC.

A quadrilateral is drawn to circumscribe a circle (see Fig. 10.12). Prove that .
O X Y X' Y' P Q C A B
Fig. 10.13
A B C D R Q P S
Fig. 10.12

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