Archive | Geometry

The category for all things Geometry.

Cultivating original thinking

An interesting thing happened today. A girl I was working with, who’s had virtually no schooling in geometry, made a brilliant “leap” in a geometry problem. This student was starting a unit on fractions, and the curriculum was describing a standard way of conceptualizing fractions. The book was showing that if you divide a given […]

New GEOMETRY Product on Horizon

New Geometry product on horizon from Singing Turtle Press. Math author Josh Rappaport is coming out with an eBook on geometry. Read this post to find out more!

Summertime Geometry Scavenger Hunt

Math is everywhere, when you start looking for it. In this post you learn about a fun summertime geometry project. Have your children look at highway signs and try to find as many geometric objects as they can. They can even come up with geometry problems based on the signs, too.

James Bond Math Challenge

Take this informal quiz. Watch this clip from a James Bond movie, and see what math themes and patterns you can find in the art and visuals. Then drop me a comment. I’ll share all comments that make reasonable statements.

Rubik’s Slide: play your way to geometric knowledge

The people who gave us the Rubik’s Cube recently came out with another fun puzzle, the Rubik’s Slide. This post tells all about this fun puzzle, which actually helps students learn some geometric concepts.

Invisible Misunderstandings: Square roots of 2 and 3

There are large chunks of mathematical knowledge that we often assume students have down. In fact, they often lack that knowledge. A good example is this: most students I work with have virtually no sense as to the value of the square root of 2 or the square root of 3. This post offers a […]

Origins of the Coordinate Plane

One of the legends of math relates to the invention of the coordinate plane system. The legend states that Descartes was inspired to invent this system after watching a fly move around on the ceiling over his bed. This post tells the story and points out its relevance for modern math teachers.

Answer, Fun Math Problem

Here is the answer to an interesting problem: what provides a better fit, a square peg in a circular hole, or a circular peg in a square hole? We can use simple geometry to figure it out!

FUN MATH PROBLEM — Circling the Square & Vice-Versa

Circle the Square or square the circle. Either way, it’s a fun math problem. Feel free to try it, share it, use it however you wish.

How to Use Definitions in Geometry

Definitions are TWICE as useful as standard theorems in geometric proofs. This post explains why, showing that definitions are, in a certain sense, very much like “reversible coats.”