What is the formula for calculating the length of the space diagonal of a right rectangular prism on the basis of the prism's length l, width w, and height h?

Question

kg1975 · Answer

This is Pythagorean theorem for a 3D Triangle basically... 

 A^2+B^2+C^2 = D^2 

 edit: all rectangular prisms are "right angled" ;D

mathmale · Answer

rootie:  Haven't we discussed a similar question before?  If I recall correctly, the previous question has actual, numerical measurements shown, whereas now you have only l, w and h.  

Could you not apply what you learned in the previous problem to develop the desired formula here?

mathmale · Answer

Check out the formula given you by kg1975.  Can you derive his / her formula?

kg1975 · Answer

her xD

rootbeer003 · Answer

Sorry but those arnt one of the choices..

kg1975 · Answer

Option A: d = l2 + w2 + h2 
Option B: d = sqrt l2 + w2 + h2 
Option C: d= h2 = l2 + w2 
Option D: d =square rt l + w +h

are these your choices?

rootbeer003 · Answer

sort of

kg1975 · Answer

u can use the formula i gave u to make another formula thats the answer. ive had this questuon before... the answer is B

kg1975 · Answer

ok?

rootbeer003 · Answer

O k but im going to look into it myself

kg1975 · Answer

mmkay