Solution by Liz Fast , Forest Hills Northern High School
First, we'll draw one new line segment and assign the following labels to the angles in our drawing. Then we make the following observations:
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Now, using the law of sines, we can write 
, which gives us 
.
Nico Grossfeld (Berkley H.S.); Vaughn Haack (Coopersville H.S.) ; Alex Bergquist, Brooke Boer, Ashley Botham, Allison Bryan, Tessa Cantu, Max Dixon, Mischa Dylewski, Josh Harrison, Allison Jennings, Kirsten Johnson, Ryan Klock, Kristen Krcmarik, Derek Mead, Corinne O'Grady, Nick Oostendorp, Dan Ottenwess, Drew Reyelts, Jake Rollenhagen, Brendan Ross, Aaron Sayfre, Kelvin Shuneson, Laura Stevenson, Dani Tyner, Nicole Tyner, Marc Walker, Kevin Weaver, Carly Wordelman, Alex Zheutlin (Forest Hills Eastern H.S.); Osama Chaudhury, Liam Considine, Amanda Gade, Whitney Herman, Amanda Ly, Emily Ly, Marieme Mbaye, Alex Mead, Barret Vollmer, Maurice Wong (Forest Hills Northern H.S.); Jelena Paripovic, Ben Rizzo (Haslett H.S.); Phil Dirkse (Jenison H.S.); Connor Clinton, Robert Harrison, Wes Kaguni, Alex Robinson, Alex Tombelli (Lansing Catholic H.S.); Karrie Juengel (Linden H.S.) ; Luke Brechtelsbauer (Lumen Christi H.S.); Kyle Grooms (Marshall H.S.); Nonie Arora, Monica Ayala, Siyi Chen, Matt Fegert, Tyler Hoover, Chaitanya Kanitkar, Josh Lovatt, Kevin Michalzuk, Brian Morisette (Novi H.S.) ; Willa Chen (Plymouth-Canton Educational Park); Deanna Abrash, Armila Francis, Sharon Frank, Sarah Roth, Lauren Valentine (Plymouth Christian Academy); Rachel Throop (Traverse City Central H.S.); Jessica Greenfield (no school given); Elizabeth Lyons, Brady Morrison, Paige Perry (Alamo Heights H.S., San Antonio, TX).