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60=(7+l).l
60=7l+l²
l²+7l-60=0
(l-5)(l+12)=0
l=5 atau l=-12 (TM)
jadi l=5cm
maka p=7+l=7+5=12 cm
K=2(p+l)
K=2(12+5)
K=2(17)=34 cm