MathDB
Triangle Cevians

Source:

February 21, 2006
geometryratiosearchfunctionarea of a triangleHeron's formulaalgebra

Problem Statement

Point PP is inside ABC\triangle ABC. Line segments APDAPD, BPEBPE, and CPFCPF are drawn with DD on BCBC, EE on ACAC, and FF on ABAB (see the figure at right). Given that AP=6AP=6, BP=9BP=9, PD=6PD=6, PE=3PE=3, and CF=20CF=20, find the area of ABC\triangle ABC.
[asy] size(200); pair A=origin, B=(7,0), C=(3.2,15), D=midpoint(B--C), F=(3,0), P=intersectionpoint(C--F, A--D), ex=B+40*dir(B--P), E=intersectionpoint(B--ex, A--C); draw(A--B--C--A--D^^C--F^^B--E); pair point=P; label("AA", A, dir(point--A)); label("BB", B, dir(point--B)); label("CC", C, dir(point--C)); label("DD", D, dir(point--D)); label("EE", E, dir(point--E)); label("FF", F, dir(point--F)); label("PP", P, dir(0));[/asy]