What is the relationship between length and the dot product of two vectors in R2? For example

if vector x = [2 5] and vector y = [1, 6]

I know the dot product of x * x = the length of x but what if it is x * y? Does that represent the length of anything? I'm having trouble making this connection.

Question

What is the relationship between length and the dot product of two vectors in R2? For example

if vector x = [2 5] and vector y = [1, 6]

I know the dot product of x * x = the length of x but what if it is x * y? Does that represent the length of anything? I'm having trouble making this connection.

anonymous · Answer

never mind, its just the scalar or vector projection