Respuesta :

A partir de las informaciones de la pregunta, se encontró que el lado del primer cuadrado es igual a 7 cm.

Square

The square is a quadrilateral that has all sides (x) equals and angles equal to 90°. The perimeter of a square is equal to the sum of sides, so, p=x+x+x+x=4x.  And the area of square formula is A=x².

Therefor, the AREA 1= x².

From problem data, you can write the area 2.

                   AREA 2 =(x+3)*(x+3)=x²+51, then

                                    x²+3x+3x+9=x²+51

                                    6x=51-9

                                    6x=42

                                    x=7

Learn more about area of square here:

https://brainly.com/question/11239678

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