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221 = 17×l
221:17=l
l =13cm
keliling= 2(p+l)
=2(17+13)
=60cm
b)luas = p×l
120 =p×7,5
120:7,5=p
p =16cm
keliling =2(p+l)
=2(16+7,5)
=2(23,5)
=47cm