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Kelilingnya = 36cm, maka
K = s+s+s
36 = 4x+3x+2x
36 = 9x
= x
4 = x
maka:
AB = 4x = 4 x 4 = 16cm
BC = 3x = 3 x 4 = 12cm
AC = 2x = 2 x 4 = 8cm