I have this problem. I solved it all by hand.
It is quite straightforward in general.
But the solution has a lot of calculations.
So I just want to verify the answers which I got.
We have four points in Euclidean 3D coordinate space
(given with their orthogonal coordinates).
$A(-1,2,3)$
$B(0,4,4)$
$C(2,0,2)$
$D(-1,3,2)$
$M$ is the midpoint of the segment $AB$
We need to find
a) the distance from point D to the plane ABC
b) $\tan \measuredangle ACM$
I get these answers
a) $ 3 / \sqrt{5} $
b) $ 2 / ( 3 \sqrt{5} ) $
I wonder if someone could verify these answers with some software or via some other means.