Channel: MindYourDecisions

Category: Science & Technology

Tags: mathematicsmathspuzzlemath puzzlemathbrain teaserriddle

Description: Thanks to Dhrubajyoti for the suggestion! A similar problem was asked to class 10 students in India (Q33 from SMO junior 2016). I admit that this one stumped me. Can you figure it out? Solution presented: post by Thomas Hill on Quora quora.com/In-a-triangle-ABC-AB-AC-angle-BAC-100-circ-Let-D-be-a-point-such-that-B-is-an-interior-point-of-AD-and-AD-BC-How-can-you-find-angle-BDC Other solutions jwilson.coe.uga.edu/EMT668/EMT668.Folders.F97/Rapley/EMT725/100deg/100deg.html jwilson.coe.uga.edu/EMT668/EMAT6680.F99/Wise/essay1/essay1.htm gogeometry.blogspot.com/2011/11/problem-685-isosceles-triangle-100-40.html twitter.com/jldavilaa01/status/895386114390970368 Subscribe: youtube.com/user/MindYourDecisions?sub_confirmation=1 Send me suggestions by email (address at end of many videos). I may not reply but I do consider all ideas! If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay. Book ratings are from January 2022. My Books (worldwide links) mindyourdecisions.com/blog/my-books/#worldwide My Books (US links) Mind Your Decisions: Five Book Compilation amzn.to/2pbJ4wR A collection of 5 books: "The Joy of Game Theory" rated 4.2/5 stars on 224 reviews amzn.to/1uQvA20 "The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 4/5 stars on 24 reviews amzn.to/1o3FaAg "40 Paradoxes in Logic, Probability, and Game Theory" rated 4.1/5 stars on 38 reviews amzn.to/1LOCI4U "The Best Mental Math Tricks" rated 4.2/5 stars on 76 reviews amzn.to/18maAdo "Multiply Numbers By Drawing Lines" rated 4.3/5 stars on 30 reviews amzn.to/XRm7M4 Mind Your Puzzles: Collection Of Volumes 1 To 3 amzn.to/2mMdrJr A collection of 3 books: "Math Puzzles Volume 1" rated 4.4/5 stars on 87 reviews amzn.to/1GhUUSH "Math Puzzles Volume 2" rated 4.1/5 stars on 24 reviews amzn.to/1NKbyCs "Math Puzzles Volume 3" rated 4.2/5 stars on 22 reviews amzn.to/1NKbGlp 2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter. My Blog mindyourdecisions.com/blog Twitter twitter.com/preshtalwalkar Merch teespring.com/stores/mind-your-decisions Patreon patreon.com/mindyourdecisions Press mindyourdecisions.com/blog/press