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 […]

# Tag Archives: Geometry

# 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.

# 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.

# 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.”

# ANSWER TO FRIDAY’S PROBLEM:

Answer to Friday’s problem, regarding the number of diagonals that can be drawn in any convex polygon.

# Challenge Problem – Polygon Diagonal Formula

Polygons have diagonals. There is a formula for the number of diagonals that a polygon has. For a challenge, find the algebraic formula that governs how many diagonals there are in any convex polygon with n sides. Good luck!

# (Less) Curiouser and Curiouser

If curiosity killed the cat, the cat took one too many tests Today I tutored two girls … with two radically different levels of curiosity The first girl, an eleventh grader, taking Algebra 2. The second, a fifth grader, working on elementary school math. The older girl was studying logarithms. I started to try to […]