阅读材料:如图(1),在四边形ABCD中,对角线AC⊥BD,垂足为P,求证:S四边形ABCD=AC・BD. 证明阅读材料:如图(1),在四边形ABCD中,对角线AC⊥BD,垂足为P,求证:S四边形ABCD=AC・BD.证
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