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l = x
K = 2(p+l)
54 = 2(x + 3 + x)
54 = 2(2x + 3)
54 = 4x + 6
54 - 6 = 4x
48 = 4x
48 : 4 = x
12 = x
p = x + 3 = 12 + 3 = 15 cm
l = x = 12 cm
luas = p x l
Luas = 15 cm x 12 cm = 180 cm²
misal lebar = y
maka
2(3+y+y)=54
6+2y+2y=54
6+4y=54
4y=54-6
4y=48
y=48/4
y=12
maka luas =
p x l
3+y x y
3+12 x 12
15 x 12
180