The classic treatise in geometry written by Euclid is presented in English. It is the textbook used for more than 1,000 years in western Europe.

This page of Geometry links addresses many of the Geometry expectations in the Ontario K-8 Math curriculum. There are simple sorting exercises for Grade One and Cartesian Graphing tasks for the intermediate grades.

Investigate dilations using this interactive resource. Students are given an opportunity to explore how scale factors can be used to enlarge or reduce the size of a given figure. Be sure to follow the link to the printable activities,...

Could the altitude of the city hosting the Olympic and Paralympic Games have an effect on performance in the long jump? This challenging activity encourages mathematical reflection, investigation and discussion as students explore how...

How would you write a LOGO program to approximately reproduce the Olympic Rings logo? This activity is designed to be accessible to students at all levels of secondary maths (Key Stages 3, 4 and 5).

This site has links to review pages on many high school and college math topics including Calculus.

Learners will learn and reinforce skills for measuring perimeter and area of 2D shapes and measuring surface area and volume of 3D shapes.

Offers an explanation of what a geometric construction is and what some of the tools are that are used for it, including the traditional straightedge and compass. The site explains how to construct various polygons inscribed within a...

The properties of the medians of a triangle are explored using an interactive geometry applet.

The geometry tutorial explores problems related to the surface area and volume of a cone. The activity has several examples with detailed solutions.

Learners explore the geometry topic of parallelograms. The word problems include detailed solutions.

Provides advanced information about circles through the use of examples and a brief video lesson. [1:00]

[Free Registration/Login may be required to access all resource tools.] In this lesson, students apply chord theorems. Students examine guided notes, review guided practice, watch instructional videos and attempt practice problems.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students about tangent lines and how to apply theorems related to tangents of circles.

Explains angles and parallel lines through examples and a video lesson.

Goes over the equation of a circle, parametric equations of a circle, intersection of circle and line, tangent line in a point of a circle, etc.

This website contains an easy to understand explanation of vanishing point and other concepts of linear perspective.

This standards-based NCTM website offers resources for teachers of mathematics for all grade levels, including interactive math tools, lesson plans, online resources, and the like.

Alex and his friends are studying for a geometry test and one of the main topics covered is parallel lines. They each write down what they think it means for two distinct lines in a plane to be parallel. Students are asked to analyze...

In this inquiry-based lesson plan, students will discover the formulas for the surface area of pyramids and cones. This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project.

Learners explore the definitions and properties of the perpendicular bisector. The interactive activity includes an applet to explore the properties of the perpendicular bisector.

Here are five triangle problems to solve using the Law of Sines, Law of Cosines, Pythagorean Theorem, and trigonometry. All problems have detailed written solutions included.

Contains a long detailed biography of Pierre-Simon Laplace.

This site contains events of the life of Gottfried Leibnitz. It is presented in a timeline form.