Question

A million years ago, an alien species built a vertical tower on a horizontal plane. When they returned they discovered that the ground had tilted so that measurements of 3 points on the ground gave coordinates of (0, 0, 0), (1, 1, 0), and (0, 1, 2). By what angle does the tower now deviate from the vertical?

Answer 1

find two vectors from (0,0,0) to (1,1,0) and (0,0,0) to (0,1,2)
cross them to get the normal (to the ground) compare that with the vector (0,0,1) {like in the previous problem you did, to find the angle between}

Answer 2

ok thank you

Answer 3

sure.