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p = 20 cm
maka
P = 20 · 400
⇒ P = 8.000 cm
⇒ P = 80 m
dan
l = 8 cm
maka
L = 8 · 400
⇒ L = 3.200 cm
⇒ L = 32 m
maka luas sebenarnya
L asli = P · L
= 80 · 32
= 2.560 m²
Terimakasih semoga mmbantu