Tags » Geometry

Ask, Don't Tell

I was invited to write a few posts for NCTM’s Mathematics Teacher Blog: Joy and Inspiration in the Mathematics Classroom.

Ask, Don’t Tell (Part 4): The Equation of a Circle… 420 more words


Activities for Teaching Polygons

I recently taught an introductory lesson about polygons to a class of 5th graders. Initially there wasn’t much enthusiasm, until I provided math manipulative, such as geoboards and string to get up and moving. 212 more words


Complexity of Void

This beaded sphere was started 4.5 years ago. It was just over halfway done with just the foreground figures complete. It went on the shelf at that time as I was just learning how to make Temari. 163 more words


Seated triangle

A triangle is a 3-sided polygon sometimes (but not very commonly) called the trigon. Every triangle has three sides and three angles, some of which may be the same. 63 more words


Geometry : Straight line equation

How to form the equation of the line passing through 2 points, say, A (2,1) and B (5,10) ? First find the gradient of the line. 152 more words

Additional Mathematics