Vectors

Scalar Product of Vectors

Keywords: multiplication of vector, scalar multiplication, scalar product of vectors

Scalar Product of Vectors

a = x 1 i + y 1 j ,     b = x 2 i + y 2 j
a · b = | a | | b | c o s α
a · b = x 1 · x 2 + y 1 · y 2

In case of 3D:

a=x1i+y1j+z1k
b=x2i+y2j+z2k
a · b = x 1 · x 2 + y 1 · y 2 + z 1 · z 2