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80=(2.p)+(2.15)
80-30=2p
50/2=p
25=p
L=pxl
=25x15
=375 cm persegi
lebar= 15 cm
rumus keliling persegi panjang
K= p+p+l+l
K=2(p+l)
masukkan angka
80=2(p+15)
80=2p+30
80-30=2p
50=2p
25=p
panjang persegi panjang 25cm
rumus luas persegi panjang
L=p×l
L=25×15
L=375cm²
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