Peter N. answered 03/21/19
Tutor
5.0
(1,057)
PhD with over 20 years experience teaching and tutoring
The diagonal in a 3D prism can be found by using a variation on the Pythagorean Theorem that adds one dimension: d2 = x2 + y2 + z2, or d = √(x2 + y2 + z2).