Find the direction cosines of the sides of the triangle whose vertices are (3, 5, –4), (-1, 1, 2) and (–5, –5, –2).

Question

Philoid · Accepted Answer

The direction cosines of the two points passing through A(x₁, y₁, z₁) and B(x₂, y₂, z₂) is given by

(x₂ – x₁), (y₂-y₁), (z₂-z₁)

And the direction cosines of the line AB is

Where AB =