摘要：连接AC.在Rt△ABC中.AB=3 BC=4 则 AC=5 . ∵ (AC)2+(CD)2 =25+144=169 (AD)2 =(13)2 =169 ∴ (AC)2+(CD)2 =(AD)2 ∴△ACD是Rt△ ∴草坪面积=ABBC+ACCD=3×4+5×12=6+30=36.

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