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864 = 2.s² + 4.s.12
864 = 2.s² + 48.s
2s²+48s-864 = 0 ---> kdua ruas dibagi 2 menjadi:
s²+24 s-432 = 0
(s-12)(s+36) = 0
s = 12 atau s = -36 ( tdk memenuhi)
jadi,p.sisi = 12 cm