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Verified answer
P-l = 12 cmp= l+12
K=2(p+l)
=2(l+12+l)
=2l+24+2l
=4l+24
4l+24=80 cm
4l =80-24
=56
l=14 cm
p=l+12
=14+12
=26 cm
Luas =pl
=26 x 14
=364 cm²