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切割為三個三角形△ABE△BCD和△BED △ABE△BCD兩個三角形面積之和AE*AB*0.5+0.5*BC*CD=3*3=9 ,ED=3,BE=(AB^2+AE^2)^1/2,BD=(BC^2+CD^2)^1/2 △BED的面積由海倫公式求出 五邊形18
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