kl=2p×2l
30=2(9)+2l
30=18+2l
18+2l=30
2l=30-18
2l=12
l=6cm
L=p×l
L=9×6
L=54 cm²
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kl=2p×2l
30=2(9)+2l
30=18+2l
18+2l=30
2l=30-18
2l=12
l=6cm
L=p×l
L=9×6
L=54 cm²