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sisi 1 = 2x-1
sisi 2 = x+3
sisi3 = 3x-1
K = 19 cm
maka :
K = sisi (1+2+3)
19 = 2x-1 + x+3 + 3x-1
19 = 6x + 1
6x = 19-1
x = 18/6
x = 3 cm
jadi nilai x = 3 cm
2x-1+x+3+3x-1 = 19
6x+1 = 19
6x = 19-1
6x = 18
x = 18/6
x = 3 cm