The hardest problem on the hardest test – YouTube

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The hardest problem on the hardest test

A difficult geometry puzzle with an elegant solution.
Practice more problem-solving at https://brilliant.org/3b1b

Solution to the puzzle mentioned at the end: https://brilliant.org/3b1bindicator/

Special thanks to the following patrons:
http://3b1b.co/putnam-thanks

These videos exist thanks to Patreon:
https://www.patreon.com/3blue1brown

A different write-up of this solution:
http://lsusmath.rickmabry.org/psisson/putnam/putnam-web.htm

1992 Putnam with this problem:
http://kskedlaya.org/putnam-archive/1992.pdf

A problem with a similar flavor came up on the 2005 Putnam A6. Give it a try! In the solutions for that problem, by the way, the that Calvin Lin is a friend of mine who works at Brilliant.
http://kskedlaya.org/putnam-archive/2005.pdf
http://kskedlaya.org/putnam-archive/2005s.pdf

Music by Vincent Rubinetti: https://soundcloud.com/vincerubinetti/

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