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2(p×l) = 80 cm
p×l = 40cm
p = 5/8 × 40 = 25 cm
l = 3/8 × 40 = 15 cm
L = p×l
L = 25 × 15
L = 375cm
16x = 80 cm
x = 5 cm
panjang = 5 x 5 = 25 cm
lebar = 3 x 5 = 15 cm
Luas = pxl
15x25 cm
375 cm²