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GT = 1/2 diagonal Ruang kubus
= 1/2 8√3
= 4√3
MG =√GH²+HM²
= √8²+4²
= √4²(2²+1)
= 4√5
MT = √MG²-GT²
= √(4√5)²-(4√3)²
= √80-48
= √32
= 4√2