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3p=5l
p=5/3l
keliling=p+l+p+l
80cm=5/3l+l+5/3l+l
80cm=16/3l
80:16/3=l
80x3/16=l
15cm=l
5/3l=5/3x15cm=25cm
luas=pxl
=25cmx15cm
=375cm²