# 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

Posted in Puzzles | Tagged , | 9 Comments

## 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

Posted in Puzzles | Tagged , | 3 Comments

## 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

Posted in Solution | Tagged , | 1 Comment

## 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

Posted in Puzzles | Tagged , | 3 Comments

## 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

Posted in Puzzles | Tagged , | 1 Comment

## Solution to Puzzle #101: Shortest Path Touching the X-axis

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

Posted in Solution | Tagged , | 1 Comment

## Puzzle #101: Shortest Path Touching the X-Axis…

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