Geometry Problem 2

http://tomlinhollyblog.blogspot.com/2008/05/geometry-problem-2.html

Two right triangles are formed so use Pythagorean's Theorem.

Geometry Problem 1

http://tomlinhollyblog.blogspot.com/2008/05/geometry-problem-1.html

Don't forget that the bottom of the box is a rectangle with sides of 6 and 8.