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L=10,2M
l=10,2:3=3,4m
P=2(L+l)
=2(10,2+3,4)
=2 inmultit cu 34,68 (INMULTESTI SI TU)
Cat costa: Inmultesti ce ti-a dat perimetru cu 5,2
l = 10,2 : 3 => l = 3.4 m
Lungime gard = 2xL + 2xL = 2x10.2 + 2x3.4 => Lungime gard = 20.4 + 6.8 = 27,2 m
1m ...... 5,2 lei
27,2 m ....... x lei
x = 27,2 x 5.2 / 1
x = 735,488 lei => ( regula de 3 simpla )