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傾斜角π/6 k=√3/3 所以y=√3/3*x 代入 x^2/3=4x x=0,x=12 y=√3/3*x=4√3 所以兩個頂點(12,4√3),(0,0) 邊長是a 則a^2=192 S=√3/4*a^2=48√3
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