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maka p+l = 64/2 = 32
perbandingan p:l = 5:3
maka l = 3 / (5+3) x 32 = 3/8 x 32 = 12 cm
keliling=2(p+l)
64= 2(p+l)
2(p+l)=64
p+l=64/2
p+l=32
lebar=3/8*32=12