In Exercises $33-36$ the dimensions of a rectangular box are given. Sketch the box and find the length of a diagonal of the box.
we know that a squared is 12 squared plus four squared, which is 144 plus 16. There for a squared is 1 60 therefore, is the skirt of 1 60 Now we know we can introduce a new variable. D squared is a squared under 60 plus three squared, which is nine, which is a skirt of 169. Therefore 13 is D.