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k=2(p+l)
16=2(4+l)
8=4+l
l=4
L=p×l
L=4×4
L=16cm²
b)k=20 l=3
20=2(p+3)
10=p+3
p=7
L=7×3
L=21cm²
c)p=11m k=38m
38=2(11+l)
19=11+l
l=8
L=11×8
L=88m²
d)k=44m l=7m
44=2(p+7)
15=p
L=15×7
=105
e)p=8mm k=28mm
28=2(8+l)
11=l
L=8×11
=88mm²
f)k=60mm l=12mm
60=2(p+12)
3=p
L=3×12
=36mm²
g)p=21cm k=60mm
60=2(21+l)
9=l
L=21×9
=189cm²
h)k=114cm l=22cm
114=2(p+22)
35=p
L=35×22
=770cm²