# Category:Definitions/Direction Cosines

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This category contains definitions related to Direction Cosines.

Related results can be found in Category:Direction Cosines.

Let $\mathbf a$ be a vector quantity embedded in a Cartesian $3$-space.

Let the angles which $\mathbf a$ makes with the $x$-axis, $y$-axis and $z$-axis be $\alpha$, $\beta$ and $\gamma$ respectively.

Then the **direction cosines** of $\mathbf a$ are $\cos \alpha$, $\cos \beta$ and $\cos \gamma$, defined individually such that:

- $\cos \alpha$ is the
**direction cosine of $\mathbf a$ with respect to the $x$-axis**

- $\cos \beta$ is the
**direction cosine of $\mathbf a$ with respect to the $y$-axis**

- $\cos \gamma$ is the
**direction cosine of $\mathbf a$ with respect to the $z$-axis**.

## Pages in category "Definitions/Direction Cosines"

The following 2 pages are in this category, out of 2 total.