（1)
連線AM、BM
畢氏定理過程我就省略
AM=BM=12
MN即ΔABM以AB為底的高
三邊12 12 8畢氏定理
MN=8√2
(2)
一樣用ΔABM
兩面角即<AMB
餘弦定理cosθ=12²+12²-8² / 2*12*12=7/9
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