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我覺得是直角三角形.三邊成等差數列,則中項邊長是12,這毫無疑問.內切圓周長是6π,所以內切圓半徑為3,這也不差,三角形周長是36,解題如下:假設長邊為12+d,短邊為12-d,三角形的半周長p=18,根據海倫公式S=√[p(p-a)(p-b…
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