Symmetry Mapping/Examples/Rotations of Square through 90 Degrees
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Examples of Symmetry Mappings
Let $S$ be a square embedded in the plane centered at the origin $O$.
A rotation of the plane through an angle of $90 \degrees$ either clockwise or anticlockwise is a symmetry mapping of $S$.
- 1978: Thomas A. Whitelaw: An Introduction to Abstract Algebra ... (previous) ... (next): $\S 34$. Examples of groups: $(5)$