0:00 Problem
1:22 Geometry
5:35 Trigonometry
Twitter thread (additional solutions)
Someone sent me this fun problem. I can solve it with a couple of trigonometry identities. Is there any easier method?
This post has the answer (though oddly stops after the easiest part of the proof): https://t.co/G2rlOnaXKW pic.twitter.com/SMp0YqCnNT
— Presh Talwalkar from MindYourDecisions (@preshtalwalkar) January 10, 2022
Excircle formula
https://artofproblemsolving.com/wiki/index.php/Excircle
Excircle formula Wikipedia
https://en.wikipedia.org/wiki/Incircle_and_excircles_of_a_triangle#Exradii
Tangent half-angle
https://en.wikipedia.org/wiki/Tangent_half-angle_formula
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