Measurement by Paul Lockhart - problems from Part I, sections 13-15

We will be talking about problems from chapters 13-15 (pgs. 78-101) of Measurement by Paul Lockhart. Bring in any questions you had or good solutions that you found! If you don't read it but you still want to come try out some interesting math, that's good too!

From the book description:
In conversational prose that conveys his passion for the subject, Lockhart makes mathematics accessible without oversimplifying. He makes no more attempt to hide the challenge of mathematics than he does to shield us from its beautiful intensity. Favoring plain English and pictures over jargon and formulas, he succeeds in making complex ideas about the mathematics of shape and motion intuitive and graspable. ...

Measurement is an invitation to summon curiosity, courage, and creativity in order to experience firsthand the playful excitement of mathematical work.