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Kell persegi panjang =2(p+l)
32=2(3x+5x)
32=2.8x
16=8x
x=2
p=3x l=5x
p=6 l=10
Luas persegi panjang=p.l
=6.10
=60cm²
l = 5
karena rumus luas persegi panjang adalah p x l maka 3 x 5 = 15