A rectangular field is 96 m long and its diagonal measures 104 m. What is the width of the field?

The length, width and diagonal form a right triangle, so width = √$(104^2-96^2)=$ √(10816 − 9216) = √1600 = 40 m. (Note 40, 96, 104 is just 8 times the triple 5, 12, 13.) Subtracting the lengths to get 8 m is not valid here.