Thursday, June 23, 2011

Problem 628: Cyclic Quadrilateral, Congruence, Parallel Lines

Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.

Click the figure below to see the complete problem 628.

Online Geometry Problem 628: Cyclic Quadrilateral, Congruence, Parallel Lines.

Posted by Antonio Gutierrez at 10:15 AM
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1 comment:

  1. PravinJune 23, 2011 at 5:51 PM

    Isosceles Triangles ABE and DCF are equiangular
    (vertical angles at B and C being equal).
    So
    <AEB = <DFC,
    and on taking supplements
    <AED = <AFD
    and thus
    A,E,F,D are concyclic
    Now <AFE = <ADB = <ACB
    Hence EF // BC

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