Is the Centroid and Circumcenter of a triangle affine invariant?

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As the title says, are the centroid and circumcenter of a triangle affine invariant? And how would I go about proving it? Thanks.

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Note that centroid is invariant since it is the intersection of medians, which intersect with a fixed ratio (2:1), whereas the cirumcenter can't be in general (think to a right triangle transformed in a equilateral triangle).