Dot product/scalar product of arbitrary size vectors (sequences of numbers). It is defined as a sum of products of all i
-th pairs of sequences. See Wikipedia
for full definition. Remember that a
vectors must be of the same size.
In a simple 2-dimensional case your vectors are points (ax, ay), (bx, by). Enter ax and ay into the first two fields of the a vector below, and bx and by into b vector's fields. Leave other fields blank and click "Calculate".