Calculating a Scalar Product Example

Finding the scalar product A dot B of two vectors. The magnitudes of the vectors are A = 4 and B = 5

Two methods to solve
Using the magnitude and angle between vectors

or

Calculating the scalar product using components

[h.k]

Do you know what the different methods are called? Great vid by the way!

[amandacosta-znoh]

when i plug it in the calculator i dont get 4.50