9)Stiim ca Pdrept.este: 2(L+l)=2L+2l
2•23+2•l=56
46+2•l=56
2•l=10
l=5
10)Notam: a-Lățimea
a+2-lungimea
Pdrept.=2l+2L
2a+2a+4=32
4a=28
a=7(latimea)
L=a+2
L=9
Triplul lungimii-3L
3•9=27
11)-aflam semiperimetul
208:2=104
l+L=104
3L+L=104
4L=104
L=26
l=26•3
l=78
2l•L=2•78•26=4056