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l = p - 5
p = p
K = 2(p + l)
50 = 2(p + p - 5)
50/2 = 2p - 5
25 = 2p - 5
25 + 5 = 2p
30 = 2p
30/2 = p
15 cm = p
l = p - 5
= 15 - 5
= 10 cm
L = pl
= 15 × 10
= 150 m²
lebar=x-5
panjang=x
2(x+x-5)=50
2x+2x-10=50
2x+2x =50+10
4x =60
x =60:4
=15
panjang=15cm
lebar=15-5
=10cm
L=p*l
=15*5
=75cm²
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