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p=l+7
K=2(p+l)
62=2p+2l
62=2(l+7)+2l
62=2l+14+2l
62=4l+14
62-14=4l
48=4l
48/4=l
12=l
p=l+7
p=12+7=19
Luas= p×l
=19×12=228 cm^2