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l=1/3x
k=2(p+l)
80/2=x+1/3x
40=4/3x
40. 3/4=x
30=x
panjang=x=30 cm
lebar=1/3 x=1/3.30=10 cm
luas=???
L=p.l
L=30.10
L=300 cm²