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p = 12 × 7 : 2 = 42 m
l = 12 × 5 : 2 = 30 m
L = 42 m × 30 m
L = 1.260 m²
p = 7x
l = 5x
K = 2(p + l)
144 = 2(12x)
x = 144/24 = 6
maka:
p = 7(6) = 42 m
l = 5(6) = 30 m
Luas = 42 m x 30 m = 1260 m²