## Girls’ Angle Bulletin, Volume 8, Number 3

Volume 8, Number 3 of the Bulletin kicks off with the first part of a 2-part interview with Hamilton College Assistant Professor of Mathematics Courtney Gibbons.  In this first half, she discusses how she got interested in math, tells us about how she learns, studies, and creates math, and explains the notions of “fixing set” and “fixing number.”  She also tells us about some of her goals as a mathematician.

The best way to learn math is to do lots of problems: after all, that’s what math is! – Courtney Gibbons

Next, Emily and Jasmine continue their exploration of n-pointed stars, or, more accurately, convex (nk)-stars.  In this installment, they succeed in finding and proving a formula for the sum of the tip angles of such stars.  The cover of this issue shows examples of (17, k)-stars. If you can find a good friend to explore mathematics together with, it can be a lot of fun and quite rewarding. What do you notice about the (11, 5)-star at right?

Next up, our second installment of Meditate to the Math which features math related to cutting a chocolate bar in half along one of its diagonals.

Anna continues her investigation of cross sections of the graph of zxy and finds a cool family of hyperbolas.

Konstanze Rietsch of King’s College London contributes a curious number puzzle borrowing characters from Lewis Carroll to state it.

In our second installment of our mini-series on the derivative, we explore basic properties of the derivative and then apply them to deduce the derivatives of any polynomial.

This issue’s Learn by Doing explains two different ways to find all primitive Pythagorean triples and then relates the two methods.

What we hope is that the Bulletin induces you to do math. That’s why this issue is filled with math questions and content that shows how others do math.

We hope you enjoy it!

Finally, a reminder: when you subscribe to the Girls’ Angle Bulletin, you’re not just getting a subscription to a magazine. You are also gaining access to the Girls’ Angle mentors.  We urge all subscribers and members to write us with your math questions or anything else in the Bulletin or having to do with mathematics in general. We will respond. We want you to get active and do mathematics. Parts of the Bulletin are written to induce you to wonder and respond with more questions. Don’t let those questions fade away and become forgotten. Send them to us!

We continue to encourage people to subscribe to our print version, so we have removed some content from the electronic version.  Subscriptions are a great way to support Girls’ Angle while getting something concrete back in return.  We hope you subscribe!