## anonymous 4 years ago Find the length of the longest pencil which can be placed in a rectangular box of dimensions 8cm x 10cm x 4cm..

1. anonymous

Answer given in the answer sheet is 13.4cm but IDK how to solve

2. anonymous

3d Pythagorean: $\sqrt{8^2 + 10^2 +4 ^2}$

3. anonymous

huh?