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設這個漏斗的高為h,漏斗底半徑為r 由題可知,漏斗地面周長即扇形的弧長 則(120/360)*2*PAI*12=2*PAI*r,即r=4cm 且園板的半徑即漏斗的斜線長,則由畢氏定理得 h=更號(12*12-4*4)
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