To find the length of the diagonal AB:

You would first use on the bottom of the box rectangle to find the diagonal CB =

Then use CB as of the triangle ACB, with AB being .

AB is approximately =

Word Bank:
5 cmthe perimeter formula for a rectangle13 cm3 cm89 cm73 cmsquare root 7 cmthe Pythagorean Theoremthe area formula for a rectangle11 cmthe hypotenusea leg