# Number Graphs

For this last session of the Fall 2014 meetings, we explored a type of number puzzle involving labeling undirected graphs.

# Numbers on Clocks

For this session, we worked on Modular Arithmetic by thinking about a circular number line arranged like a clock.

# Beguiling Tilings

Dr. Brandy Wiegers, assistant professor of mathematics at Central Washington University,  was our guest circle leader on Saturday, November 11, 2015.

Dr. Brandy introduced us to some interesting questions about covering up rectangles using simple square or rectangular tiles.

# Polygons and Area

How much fruit is in that slice of fruit? In other words, what is the area of a polygon? If the polygon is drawn on a grid, how can you find the area by counting the grid points?

# Spheres and geometry

When we look at a highway, we often think of it as a straight line. Of course it is not straight—it curves with the earth. Still, if we say that the straight lines on the surface of the earth are the great circles, then we can begin to do geometry. Continue reading Spheres and geometry

# Downtown walking distances

We began our second session by noticing that in a perfect city grid such as (some of) Boise’s downtown and north end, there are a lot of ways to get from point A to point B. So how many are there really? Continue reading Downtown walking distances

# Sona sand drawings

The Sona sand drawings are part of the oral tradition of the Tchokwe people of Angola. The drawings are both art and science, and hold many interesting mathematical properties. Continue reading Sona sand drawings