MathDB
2004 HMMT Geometry # 7

Source:

March 3, 2024
geometry

Problem Statement

Yet another trapezoid ABCDABCD has ADAD parallel to BCBC. ACAC and BDBD intersect at PP. If [ADP]=[BCP]=1/2[ADP]=[BCP] = 1/2, find [ADP]/[ABCD][ADP]/[ABCD]. (Here the notation [P1...Pn][P_1 ...P_n] denotes the area of the polygon P1...PnP_1 ...P_n.)