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garis-garis pendek=78/3=26 cm
p=78 cm
l=52 cm
L1=luas persegi panjang
=p×l
=78×52
=4.046 cm^2
L2=4 kali luas segitiga
=4×1/2×26×26
=1.352 cm^2
L1-L2=4.046-1.352
=2.704 cm^2