推 QQLeopard : 感謝你了解了 08/14 23:50
※ 引述《QQLeopard (QQ)》之銘言：
: 求各位神人求解
: https://i.imgur.com/L169y7f.jpg
GH = (1/2)AC = EF
AC = sqrt(5^2 + 12^2) = 13
HE = (1/2)BD = FG
BD = 2sqrt(5^2 + 6^2) = 2sqart(61)
GH + EF + HE + FG = AC + BD = 13 + 2sqrt(61)
選(B)
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