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如圖,AB=40÷4=10cm,∵兩個相鄰內角的度數的比為1:2,∴∠BAD=11+2×180°=60°,∴△ABD是等邊三角形,∴BD=AB=10cm,∴BO=12×10=5cm,在Rt△ABO中,AO=AB2-BO2=102-52=53cm,∴AC=2AO=2×53=103cm,∴菱形的…
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