Coin rotation paradox

<p>Imagine we have 2 coins. The radius of the larger coin is 3 times the radius of the smaller coin.</p> <p>We roll the smaller coin all the way around the edge of the larger coin, without it slipping:</p> <p><img alt="" src="https://miro.medium.com/v2/resize:fit:360/0*ApBKGHORo4KGH4Xm.png" style="height:400px; width:400px" /></p> <p>The question is, how many times will the smaller coin rotate as it rolls around the edge of the larger coin?</p> <p>The result might not be quite what you expect, and in this article, we will look at a couple of explanations why. In addition, we will explore how this paradox relates to astronomy!</p> <p><a href="https://medium.com/recreational-maths/coin-rotation-paradox-fc804195e894"><strong>Learn More</strong></a></p>