A few of our favorite things… Lauren SiegelJune 8, 2018UncategorizedLeave a Comment We are working on a larger list of fun math things, but these are definitely in the top 10. Calipers with a proportional arm. Build, use, figure out how they work! Mirror book – open and close to make all the regular polygons, make patterns, play. Unit circles – with different rings for coordinates, radians, quadrants and degrees. Mini right triangles to recall connection to pythagorean theorem. Quadrant. Ancient navigation tool, way to measure the height of distant objects. Relies on the plumb line and runs on gravity.