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sisi 1 = x
sisi 2 = x+1
sisi 3 = x+2
K = 12 cm
mk :
K = sisi 1 + sisi2 + sisi3
12 = x+x+1 +x+2
12 = 3x + 3
3x = 12-3
x = 9/3
x = 3 cm
12 = 3x + 3
12 - 3 = 3x
9 = 3x
x = 9/3
x = 3