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Verified answer
P = pl = p-5
kll persegi panjang < 2(p+l)
50 < 2(p+p-5)
50 < 2(2p -5)
50 < 4p - 10
50+10 < 4p
60 < 4p
p < 60/4
p < 15
panjang maksimum = 15cm
lebar maksimum = p-5 = 15-5 = 10cm
luas persegi panjang = P×l
15×10 = 150cm²
luas maksimum = 150cm²
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