A directory of useful objects found on the web for teaching Maths.

uses formulas to calculate the areas of quadrilaterals and circles, and converts between units of area

- Area and Volume - Formulae Sheet
- Printable, Reference, Worksheet - Print |
- GeoGebra HowTo: Construct a Rhombus
- GeoGebra, Tutorial | PDF
- The area of a triangle
- Explanation | PDF