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Can You Solve This 8th Grade Geometry Problem? 75% Got The Wrong Answer

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Channel: MindYourDecisions
Categories: Brain Teasers   |   Math  
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What is angle A in the star-shaped figure? This problem appeared on the 1999 AMC 8 test (intended for 8th grade students in the US). Approximately 75% of test-takers did not mark the correct response. Can you figure it out? Watch the video for a solution.

My blog post for this video
http://wp.me/p6aMk-4YG

Sources
https://www.maa.org/sites/default/files/pdf/CurriculumInspirations/CB002_Angles-in-a-Star.pdf

http://www.maa.org/math-competitions/1999-amc-8-general-statistics

https://artofproblemsolving.com/wiki/index.php?title=1999_AMC_8_Problems/Problem_21

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My Books

"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.9/5 stars on 24 reviews) https://www.amazon.com/gp/product/1500497444

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"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.5/5 stars on 11 reviews. https://www.amazon.com/gp/product/1517421624/

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  • prenavan Added i solved this in 10s









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