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Let
be a convex quadrilateral, and let
denote the centroids of triangles
and
respectively. Find ![$\frac{[G_A G_B G_C G_D]}{[ABCD]}.$](https://www.chess.com/bundles/web/images/image-default.445cb543.svg)

When every vector on the line
is projected onto a certain vector
the result is always the vector
Find the vector 
Convert the point
in cylindrical coordinates to rectangular coordinates.
I don't know le answers
Trust Sheldon as you answer le precalculus quiz