Respuestas

2012-11-13T21:57:37+01:00

                        x+12=20

            -----------------------------------               perimetro:56m............ por dato

           |                                          |              x+12+x+x+x+12=56

      X   |                                          |  x =8            4x+24=56

           |                                          |                  4x=32

           |                                          |                    X=8

            -----------------------------------

                         X+12

LARGO:   x+12=20

ancho:     x=8