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Tag Archives: Geometry puzzles
Solution to Puzzle #134: Rotating Coins
This was indeed a gem of a puzzle, and the more I have thought about it, the more I like it. Thanks again to Girish Tutakne for sharing this puzzle. I received a few correct answers – Suman Saraf, Prakhar … Continue reading
Puzzle #134: Rotating Coins
This is a gem of a problem pointed to me by an avid puzzler and an IITD friend (now in Philippines) – Girish Tutakne. Thanks Girish. Even though I know the answer, it still baffles me! Suppose we have 2 … Continue reading
Solution to Puzzle #131: The Pyramid Problem
This was a ver unintuitive problem, and thanks again to my nephew Karan Sharma on sending this problem. People who sent the correct answers included Abhinav Jain, Pratik Poddar and Suman Saraf. The answer is 5. It is kind of … Continue reading
Puzzle #131: The Pyramid Problem
This is a beautiful geometry puzzle contributed by my nephew, Karan Sharma. The puzzle originally appeared in a PSAT exam in 1980, and was not really a “puzzle” until one student proved that there was a different answer than what … Continue reading
Solution to Puzzle #121: The Spider and the Fly
This puzzle turned out to be more difficult than what I thought it was. There was only one correct answer – from Suman Saraf – very well done! The answer is 40 feet. There were a couple of people who … Continue reading
Puzzle #121: Spider and The Fly
This is a puzzle whose variations many people would have done already. Yet, I found this to be very nice and not as simple as it may seem at first sight. I picked this from a Martin Garder book again … Continue reading
Solution to Puzzle #103: Proof Without Trigonometry
A wonderful puzzle, and the solution is a beautiful one. This was a difficult one, and therefore I did not get as many answers to the puzzle. Abhinav was the first one to send a correct answer – and a … Continue reading
Puzzle #103: Proof Without Trigonometry
This is a wonderful puzzle I found in the puzzle collection of The Guardian newspaper, the original source being Martin Gardner. The beauty of this puzzle is that one needs to use simple rules of geometry and we do not … Continue reading
Solution to Puzzle #101: Shortest Path Touching the Xaxis
Thanks to Arunima and Amol again for contributing a wonderful puzzle. This is a famous puzzle called the Heron’s Shortest Distance Problem and has historical roots. The puzzle can be solved through calculus, but can be solved without any calculus … Continue reading
Puzzle #101: Shortest Path Touching the XAxis…
This is a beautiful puzzle initially sent to me a month back by Arunima, a friend from IIT Delhi now in Washington DC. The same puzzle was sent to me by another friend’s son, Amol Aggarwal, now doing his PhD … Continue reading