You can have 2 or 3 element vectors or a plane question
For 2 element vectors a and b, find |a|, |b|, a.b and angle between them.
For 3 element vectors a and b, find |a|, a.b and a x b.
For plane you have 3 points on plane, P1..P3, find a = P1 to P2, b = P2 to P3, n = a x b, and equation of plane by n.(P(x,y,z)-P2) in two stages.
Note for cross products, the i, j and k terms are calculated in turn.
By default these operations are animated, showing the stages in the method - and you can speed up/slow down or pause/resume the animation. However you can choose to manually step through the process.
Options
Animate