18) 2200:10=220 (diferenta laturilor)
Sp(semiperimetru)
Sp=2200:2
Sp=1100 (suma unei singure latimi si unei singure lungimi)
l------------l latimea }
l------------l---l+220 lungimea} 1100 suma
1+1=2 segmente egale
1100-220=880 (2 segmente egale)
880:2=440( o latime )
440+220=660 (o lungime)
proba
Pd=2xL+2xl
Pd=2x660+2x440
Pd=1320+880
Pd=2200
