Mathematics-Online lexicon: Angle

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	Mathematics-Online lexicon:
	Angle

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overview

Given two vectors $\vec{a},\vec{b}\ne\vec{0}$ . The associated arrows, attached with their tails to a given point (vertex), form two angels of which the smaller one is denoted by

$\displaystyle \sphericalangle(\vec{a},\vec{b}) \in [0,\pi]\,.$

$\includegraphics[width=.3\linewidth]{a_winkel}$

The two vectors are called orthogonal, $\vec{a}\perp\vec{b}$ , if the angle between them equals $\pi/2$ . By convention, the zero vector is orthogonal to every vector.

[Examples] [Links]

automatically generated 3/28/2008