Diketahui kubus ABCD.EFGH memiliki rusuk sepanjang 9 cm. Jarak titik A ke garis HB adalah…cm. A 3akar3 B 6akar6 C 3akar6 D 3 E 6

Perlihatkan ΔBAH siku siku di A
AB = s = 9
AH = s√2 = 9√2
HB = s√3 = 9√3

T pada HB sehingga AT  tegak lurus HB
AT = jarak A ke AB

AT x  HB = AB x AH
AT = (AB x AH)/(HB)
AT = (9 x  9√2)/ (9√3)
AT = 9√2 / (√3)
AT = (9/3)(√6)
AT = 3√6