Let a (2,3,1), B (4,1,2), C (6,3,7), D (- 5, - 4,8), then the distance from D to plane ABC is?

Let a (2,3,1), B (4,1,2), C (6,3,7), D (- 5, - 4,8), then the distance from D to plane ABC is?

The normal vector and Ad vector of plane are obtained by the formula from point to plane
D = | Ad vector * n vector | / | n vector | |; is the absolute value and N is the normal vector