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Jadi panjangnya 11 cm
p.l=6.p=6p
p.t=3.p=3p
l.t=6.3=18
198 = 2(18+6p+3p)
198 = 2(18 + 9p)
99 = 18 + 9p
81 = 9p
p = 81/9 = 9 cm Semoga membantu :)