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cari dulu luas bagian persegi panjang sebelah kiri
luas = p.l
luas = 10.5 = 50 cm²
trus cari luas peregi panjang yg tengah
luas = p.l
luas = 10.15 = 150 cm²
trus cari luas persegi panjang yg kanan
luas = p.l
luas = 5.10 = 50 cm²
totalnya = 50+150+50 = 250 cm² (C)