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補一個全等梯形成平行四邊形,梯形面積為平行四邊形面積一半,會出現5,12,13這樣一個三角形(平行四邊形一條邊和兩個梯形的各一條對角線),5^2+12^2=13^2,是直角三角形,面積是平行四邊形一半,等於梯形面積 所以梯形面積=5*12/2=30
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