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donc bidon =)
3/5=0.6
差距是0.015
因為圖形很小所以視覺上看不出來甲跟丙拼起來不是三角形
但是邊長比卻是8:13
明顯不成比例
所以甲+丙不是三角形
得證
現在吧三角形加梯形(也即是20加12)再乘2(32x2),的 確是64,但為何用眼睛看起來又...?
that's how it's tricky
甲+丙pas egal forme triangulaire