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= 16,5 + 12
= 28,5 cm
9) Kll = 88 cm
(2x + 10) + (3x + 15) + (3x + 15) = 88
8x + 40 = 88
8x = 88-40
8x = 48
x = 6
AB = 2x + 10 = 2(6) + 10 = 12 + 10 = 22 cm
BC = 3x + 15 = 3(6) + 15 = 18 + 15 = 33 cm
AC = BC = 33 cm
jadi panjang sisinya adalah AB = 22 cm, BC = 33 cm, AC = 33 cm