Let u and v be two vectors given in component form by

u = <u1 , v1> and v = <u2 , v2>

The dot product of the two vectors u and v above is defined by

u.v = <u1 , v1> . <u2 , v2> = u1*u2 + v1*v2

and it is a scalar quantity (rather than a vector).

__How to use the calculator__
1 - Enter the components of the two vectors as real numbers and press "Dot*". If by mistake characters other than numbers are entered, the calculator does not display any answer. The answer is a scalar.

More on vectors.