Question 352521
The square must have an edge equal to 28 cm. (Divide the perimeter of 112 cm by 4.)
The area of the square photo is then {{{28^2 = 784 cm^2}}}.
Since the border has an equal width of 6 cm, the square photo frame must have an edge equal to {{{6cm + 28cm + 6cm=40 cm}}}.  The area of the square photo frame should then be {{{40^2 = 1600 cm^2}}}.  
Therefore the area of the border is {{{1600 cm^2 - 784 cm^2 = 816 cm^2}}}.