Find the angle between two points in 3D plot.

How can we find the angle between two points in 3D plot along y-axis?

Answer 1

[Bruno Luong]

if the 3D (x-y-z) coordinates of your two points are P1 and P2, both are (3 x 1) or (1 x 3) vectors

angleradian = acos((P2(2)-P1(2)) / norm(P2-P1))

[Ali Raza]

Is that along the y-axis as figure indicating??

[Bruno Luong]

yes

[Ali Raza]

Thank U very much, I got this.

[Henry Ukwu]

can i get the angle between the two points in 3D space when projected on xy plane ?