# linear transformation and angles?

Does linear transformation, prevent preserve angle between two vectors? I guess that it is true, so if we translate normal vector of a plan, it will be orthogonal to translated plan.

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Do you mean preserve instead of prevent? –  Michael Albanese Dec 27 '12 at 11:30
@MichaelAlbanese,I,m sorry.I mean preserve. –  hasanghaforian Dec 27 '12 at 11:33

No. Imagine strectching the plane in the $x$-direction. Formally $(x,y)\mapsto (2x,y)$. The angle $(1,1)$ makes with $(1,0)$, which, originally is 45 degrees, is reduced.