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l= 10 cm
L= 400 cm²
L= p x l
400=5x · 10
40=5x
x=40/5
x=8
maka p sebenarnya...
p= 5x = 5 · 8 = 40 cm
bukti:
L= p x l
L= 40 x 10
L= 400 cm²