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buat T pada DF sehingga HT tegak lurus DF
HT = jarak H ke DF
DH = 6
DF = 6√3
HF = 6√2
HT . DF = DH . HF
HT (6√3) = 6 (6√2)
HT = 6(6√2)/6√3
HT= 2√6