Hi,

I have three points in the space, X, Y, Z, each identified with three space coordinates.

X(x1,y1,z1)Now I have two segments, one from X1 to X2, the other from X2 to X3.

Y(x2,y2,z2)

Z(x3,y3,z3)

How can I quickly get the angle between these segments with my HP-35S and the vectors capabilities?

Thanks in advance to anyone answering.

-- Antonio