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= (2 * (3 + x)) + 2x
= (6 + 2x) + 2x
54 = (6 + 2x) + 2x
54 - 2x = 6 + 2x
54 - 6 = 2x + 2x
48 = 4x
x = 12
L = p * l
L = (x + 3) * x
L = 15 * 12
L = 180
p = l + 3
rumus keliling = 2(p+l)
2(l+3+l)=54
2(2l+3)=54
4l+6=54
4l=48
l= 48/4 = 12 cm
p= 15 cm
L= pxl
L=15x12
L=180 cm kuadrat