|
Scalar product of two vectors: orthogonal vectors |
 |
Two vectors are orthogonal if their scalar product is zero
| $$\begin{pmatrix}a\\b \end{pmatrix}$$ | . | $$\begin{pmatrix}c\\d \end{pmatrix}$$ | = ac+bd = 0 |
|---|
| orthogonal ! |
|
Example:
| $$\begin{pmatrix}1\\-1 \end{pmatrix}$$ | . | $$\begin{pmatrix}-1\\-1 \end{pmatrix}$$ | = 0 |
|---|
|
|---|
See those vectors→