Răspuns:
P=3 km
P=2*L+2*l
l-100=[tex]\frac{L}{2}[/tex]
L=2*(l-100m)
L=2*(l-0,1 km)
P=2*L+2*l
3=2*[2*(l-0,1)]+2*l
3=4*(l-0,1)+2*l
3=4*l-0,4+2*l
3=6*l-0,4
6l=3,4
l=0,5(6)
L=2*(l-0,1 km)
L=2*(0,5(6)-0,1)
L=2*0,4(6)
L=0,9(3)
P=2*L+2*l
P=2*0,9(3)+2*0,5(6)=3 km Adevarat