# Slicing Pizzas, Racing Turtles, and Further Adventures in Applied Mathematics

Princeton University Press, May 2, 2012 - Mathematics - 304 pages

Have you ever daydreamed about digging a hole to the other side of the world? Robert Banks not only entertains such ideas but, better yet, he supplies the mathematical know-how to turn fantasies into problem-solving adventures. In this sequel to the popular Towing Icebergs, Falling Dominoes (Princeton, 1998), Banks presents another collection of puzzles for readers interested in sharpening their thinking and mathematical skills. The problems range from the wondrous to the eminently practical. In one chapter, the author helps us determine the total number of people who have lived on earth; in another, he shows how an understanding of mathematical curves can help a thrifty lover, armed with construction paper and scissors, keep expenses down on Valentine's Day.

In twenty-six chapters, Banks chooses topics that are fairly easy to analyze using relatively simple mathematics. The phenomena he describes are ones that we encounter in our daily lives or can visualize without much trouble. For example, how do you get the most pizza slices with the least number of cuts? To go from point A to point B in a downpour of rain, should you walk slowly, jog moderately, or run as fast as possible to get least wet? What is the length of the seam on a baseball? If all the ice in the world melted, what would happen to Florida, the Mississippi River, and Niagara Falls? Why do snowflakes have six sides?

Covering a broad range of fields, from geography and environmental studies to map- and flag-making, Banks uses basic algebra and geometry to solve problems. If famous scientists have also pondered these questions, the author shares the historical details with the reader. Designed to entertain and to stimulate thinking, this book can be read for sheer personal enjoyment.

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### Contents

 Chapter 1 Broad Stripes and Bright Stars 3 Chapter 2 More Stars Honeycombs and Snowflakes 13 Chapter 3 Slicing Things Like Pizzas and Watermelons 23 Chapter 4 Raindrops Keep Falling on my Head and Other Goodies 34 Chapter 5 Raindrops and Other Goodies Revisited 44 Chapter 6 Which Major Rivers Flow Uphill? 49 Chapter 7 A Brief Look at π e and Some Other Famous Numbers 57 Chapter 8 Another Look at Some Famous Numbers 69
 Chapter 16 The Great Explosion of 2023 146 Chapter 17 How to make Fairly Nice Valentines 153 Chapter 18 Somewhere over the Rainbow 163 Chapter 19 Making Mathematical Mountains 177 Chapter 20 How to make Mountains out of Molehills 184 Chapter 21 Moving Continents from here to there 196 How to Flatten Spheres 204 Chapter 23 Growth and Spreading and Mathematical Analogies 219

 Prime Fibonacci and Hailstone 78 Chapter 10 A Fast way to Escape 97 Chapter 11 How to Get Anywhere in about FortyTwo Minutes 105 Chapter 12 How Fast should you Run in the Rain? 114 Pursuit Curves 123 Logarithmic Spirals 131 Chapter 15 How Many People have Ever Lived? 138
 Chapter 24 How Long is the Seam on a Baseball? 232 Chapter 25 Baseball Seams Pipe Connections and World Travels 247 Chapter 26 Lengths Areas and Volumes of all Kinds of Shapes 256 References 279 Index 285 Copyright

### About the author (2012)

Robert B. Banks (1922-2002) was the author of Towing Icebergs, Falling Dominoes, and Other Adventures in Applied Mathematics (Princeton). He was professor of engineering at Northwestern University and dean of engineering at the University of Illinois at Chicago.