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How to prove that in an isosceles triangle circumcenter, centroid, orthocenter & incentre are collinear?

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    A good start would be finding out how this line relates to the isoceles triangle.2011-02-11
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    tried it aalready2011-02-11
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    The obvious axis of symmetry of the triangle is a height, a median, an angle bisector, ...2011-02-12
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    Any point definable from the triangle in terms of Euclidean geometry will be fixed by any Euclidean symmetry of the triangle.2011-02-13

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