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panjang rusuk kubus 1 = S
panjang rusuk kubus 2 = s
S = s + 3
6 x s² + 270 = 6 x S² ... (*)
s² + 45 = S² (kedua ruas di bagi 6)
subtitusikan S = s + 3 ke (*)
s² + 45 = (s + 3)²
s² + 45 = s² + 6s + 9
s² - s² - 6s = 9 - 45
- 6s = -36
s = 6 cm
S = s + 3
S = 6 + 3
S = 9 cm