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Sehingga perbandingan sisi-sisi yang bersesuaian akan sama :
x = × 6 = 18 cm
Jadi x = 18 cm
(12 + 4) / (6 + x) = 12 / x
16 / (6 + x) = 12 / x
16 x = 12 (6 + x)
16 x = 72 + 12 x
16 x - 12 x = 72
4 x = 72
x = 72/4
x = 18 m