Question 628789
Let w be the width of the rectangle. Then the length of the rectangle is given by 3w-3. For a right triangle with diagonal c and sides a and b c*c=a*a+b*b. So for this rectangle with a diagonal of 13 meters.       13*13=w*w+(3w-3)*(3w-3)
169=w*w+9*w*w-18w+9
10*w*w-18*w-160=0
*[invoke quadratic "x",10,-18,-160]
So if the width is 5 the length is 12.