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AMC 12 2018b Problem 13

  • Paper

Square ABCDABCD has side length 3030. Point PP lies inside the square so that AP=12AP = 12 and BP=26BP = 26. The centroids of △ABP\triangle{ABP}, △BCP\triangle{BCP}, △CDP\triangle{CDP}, and △DAP\triangle{DAP} are the vertices of a convex quadrilateral. What is the area of that quadrilateral?

unitsize(120);
pair B = (0, 0), A = (0, 1), D = (1, 1), C = (1, 0), P = (1/4, 2/3);
draw(A--B--C--D--cycle);
dot(P);
defaultpen(fontsize(10pt));
draw(A--P--B);
draw(C--P--D);
label("AA", A, W);
label("BB", B, W);
label("CC", C, E);
label("DD", D, E);
label("PP", P, N*1.5+E*0.5);
dot(A);
dot(B);
dot(C);
dot(D);

(A) 1002(B) 1003(C) 200(D) 2002(E) 2003\textbf{(A) }100\sqrt{2} \textbf{(B) }100\sqrt{3} \textbf{(C) }200 \textbf{(D) }200\sqrt{2} \textbf{(E) }200\sqrt{3}

Dataset text AMC 12 2000 to 2025. Quoted with source.

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C

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