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=p.l
=30cm.20cm
=600cm^2
luas persegi
=s.s
=10cm.10cm
=100cm^2
luas daerah yg diarsir
=luas persegivpanjang-luas persegi
=600cm^2-100cm^2
=500cm^2
= s.s
= 10 × 10
= 100 sm^2
Luas bangun persegi panjang
= p.l
= 30 × 20
=600cm^2
Luas bangun yang diarsil
=luas bangun persegi - luas bangun yang tidak di arsil
=600-100
=500cm^2