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k=2p+2l=2(l+5)+2l
30=2l+10+2l
30-10=4l
l=20/4=10 cm jadi lebarnya 10 cm
30=2(5+l+l)
30=2(5+2l)
30=10+4l
30-10=4l
20=4l
5=l, jadi, lebarnya adalah 5 cm