2015 AMC 12 B Problem 19 (Cyclic Quadrilateral and Similar Triangles)

1,770 views · Published 29 July 2017 · 4:46 · Indexed 10 November 2026

Channel: LetsSolveMathProblems · 2017 · People & Blogs

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Remember: Cyclic quadrilaterals - quadrilaterals that can be inscribed in a circle - have supplementary opposite angles (the converse is true, too).

The problem on this video is copyrighted by the Mathematical Association of America's American Mathematics Competitions.

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