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Cele incercuite ..........

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 23) Pp=70*4=280
Pd=2L+2l=280, L=l+68,
2(l+68)+2l=280
2l+136+2l=280
4l=144, l= 36cm
L=36+68=104 cm
 26) Pt=l1+l2+l3, l3=278 m
l3-2=l2=278-2=276 m
l2-2=l1=276-2=274 m
Pt=278+276+274=828 m