Can you solve this interesting geometry challenge?

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Hey this is Presh Talwalkar. I studied Mathematics and Economics at Stanford and post interesting topics suggested by you and viewers around the world. Members get early access to videos YouTube members https://www.youtube.com/channel/UCHnj59g7jezwTy5GeL8EA_g/join Patreon members https://www.patreon.com/mindyourdecisions Send me coffee money, or support with a one-time donation https://www.paypal.com/donate/?hosted_button_id=REZRY3QRQPYQA 2017 Shorty Awards Nominee in STEM (Science, Technology, Engineering, and Math) Press http://mindyourdecisions.com/blog/press My Books on Amazon https://www.amazon.com/Presh-Talwalkar/e/B008DKL6VG/ Send me your suggestions: click on "for business inquiries" to see my email address. *I am not accepting sponsorships/partnerships at this time, but I am happy to discuss great opportunities. For links in my video descriptions: as an Amazon Associate I earn from qualifying purchases. This has no effect on the price for you.