Examples. 1  I need a tricorder - the convenient, hand-held device featured on Star Trek that can detect life forms even from orbit. Citizendium, the Citizens' Compendium - Recent changes [en] 2  I need a tricorder - the convenient, hand-held device featured on Star Trek that can detect life forms even from.
I should mention that width and length are often interchangeable in representing the same concept - they are distinguished in relation to one another (a box may be thought of as having a 5-inch width and 6-inch length, or a 5-inch length and 6-inch width. Height is usually understood to be the dimension going upwards.
In general, if the length, width and height of a right, rectangular prism (a box) have lengths a, b and c, then the length, d, of the longest diagonal is given by the following three-dimensional version of the Pythagorean Theorem: Area vs Length. Area is measured in square units, such as square inches, square centimeters, etc.