The Spiral String Puzzle Geometry Made Simple

A cylinder is 150 meters tall with a circumference of 40 meters. It’s wrapped evenly with a string that makes 5 complete turns from bottom to top. How long is the string? 🤔 In this video, we’ll solve the puzzle step by step by unfolding the cylinder into a rectangle, applying the Pythagorean theorem, and showing how a tricky spiral can be reduced to simple right triangles. 👉 Watch until the end to see why the answer is exactly 250 meters. If you enjoy clever puzzles, math tricks, and logical problem-solving — make sure to subscribe for more!