### Angle bisector – two definitions

April 26, 2012

Definition 1. An angle bisector is a line or a ray that divides an angle in two congruent angles. In the figure below, AG is […]

### Constructing the perpendicular bisector

April 23, 2012

The objective of this activity is to construct the perpendicular bisector of a segment using compass and straight edge. The following tools will be useful […]

### How to make an improvised electrolysis apparatus

April 18, 2012

This slideshow will guide you on how to make an improvised electrolysis apparatus. Construction of an improvised electrolysis apparatus 2 You may also want to […]

### The Iron-y of Food Fortification

April 18, 2012

Some food products are  fortified with essential minerals like zinc, calcium, and iodine. Usually, these minerals are added in the form of their compounds. For […]

### The GeoGebra Interface

April 17, 2012

GeoGebra is a free dynamic mathematics software that is capable of linking concepts in algebra, geometry, calculus, and statistics. It can construct mathematical objects such […]

### Exponential function and its inverse

April 12, 2012

You can use the following interactive worksheet to help students make connection between the graphs and the equations of exponential functions and between the exponential […]

### Lesson study as a professional development model for teachers

April 4, 2012

Lesson study is a school-based approach to professional development  of teachers. We share in the following presentation the result of a research we conducted in 2004 […]

### Planning and Analyzing Mathematics Lessons in Lesson Study

March 30, 2012

The following presentation can be used as framework in planning, implementing, analyzing, and revising your mathematics lessons in your Lesson Study. Planning and analyzing mathematics […]

### Constructing congruent triangles based on SSS congruence

March 1, 2012

Constructing Congruent Triangles is a GeoGebra worksheet that you can use to teach students on how to construct a triangle congruent to another triangle. There are several […]

### Constructing congruent line segments

February 29, 2012

The most basic of all geometric constructions is constructing a segment congruent to a given segment. Geometric  construction is done using a compass and straight […]