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3179 = s x s x 11
3179 = 11s²
s² = 3179/11 = 289
s = 17 cm (panjang rusuknya)
La x t = 3179
La x 11 = 3179
La = 3179/11
La = 289
sisi = √ 289
= 17
jawabnnya = 17 cm