# Math Help - Need some help with some Maths C revision

1. ## Need some help with some Maths C revision

One of the questions say, In any given rectangular prism (dimensions a x b x c), there are 4 "space diagonals", lines that run from one vertex to the diagonally opposite vertex. Consider 2 of the space diagonals, OK and JC as shown in the diagram below. Find the relationship between a,b, and c such that the 2 space diagonals, OK and JC, are perpendicular to each other.

Thanks for the help!! I need to get this question to ace my test!!!

2. ## Re: Need some help with some Maths C revision

Label the sides of the rectangular prism and write the coordinates of the vertices. Find the slopes of the diagonals OK and JC. Their dot product should be zero.