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sisi 1 = 2x-1
sisi2 = x+3
sisi 3 = 3x-1
K = 19 cm
mka :
K = sisi1 + sisi2 + sisi3
19 = 2x-1 + x+3 + 3x-1
19 = 6x + 1
6x = 19-1
x = 18/6
x = 3 cm