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  1. R

    Symmetry of a circle proof

    OK, i think I'm almost there, I have the x'cosθ term, and I know I need to minus the purple section, which I trust is y'sinθ -- but I can't seem to show that it is, lol, it's the last stumbling block http://tng.trekcore.com/2.GIF [Broken]
  2. R

    Symmetry of a circle proof

    I've got the x'cosθ part of the expression for x, but I just cannot see how the -y'sinθ is found... http://tng.trekcore.com/1.GIF [Broken]
  3. R

    Symmetry of a circle proof

    Homework Statement http://tng.trekcore.com/1.JPG [Broken] I'm trying to prove that the circle is symmetrical by showing that x² + y² = a² holds when the circle rotates. I know that this is proved given the following two formulae: x = x'cosθ - y'sinθ y = x'sinθ + y'cosθ but I don't...
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