Start by finding the length of the deck.
Area of a rectangle is given by A=length*width.
Let's plug in the information that we know so far,
680 = length*17
solving for length, dividing by 17,
40 = length
Now that we know both dimensions of the rectangular deck,
let's calculate the perimeter,
P = 2length + 2width
P = 2(40) + 2(17)
P = 114
Hope that helps!
