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Dimensi Tiga
Kubus
r = 8 cm
Rumus cepat
Jarak F ke ACH
= 2/3 DF
= 2/3 r√3
= 2/3 × 8√3
= 16/3 √3 cm
••
dengan cara
O tengah BD
P tengah FH
R tengah AD
HO = √(HD² + DR² + RO²)
HO = 1/2 r√6 = 4√6 cm
∆FOH
X pada HO
FX ⊥ HO
HF = r√2 cm
Jarak F ke ACH
= jarak F ke HO
= HF × OP / HO
= r√2 × r / (1/2 r√6)
= 2r / √3
= 2/3 r√3
= 16/3 √3 cm