I keep getting “Dot product” questions wrong in Vectors & 3D Geometry. What's the trap?
expecting the dot product to be a vector.
The usual trap: expecting the dot product to be a vector. How to avoid it: dot product → scalar; it measures how much two vectors align. Go back to the definition — a·b = |a||b|cosθ gives a scalar and is zero when the vectors are perpendicular.
Key point
Dot product
Common mistake
expecting the dot product to be a vector.
Memory tip
dot product → scalar; it measures how much two vectors align.
Tap to watch or see it right here — the app stays open (it only opens a quick search if nothing embeddable is found).