Geometry is the study of how to use math to describe and investigate different points, lines and shapes. The way that a shape is described in geometry is with a formula, which is simply a mathematical way to calculate different...

Provides examples and a video lesson that introduce fundamental statements of geometry.

Students make connections between the coordinate grid and Geometry by finding the distance of line segments using the coordinate plane. This instructional activity includes a detailed lesson plan, slides containing notes and problems,...

Explains the basic concept of lines and angles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

A complete reference guide to horizontal lines. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

Here is a project that combines Computer Science and Mathematics. The semicircle has two tangent lines that meet at point T. You need to prove that a line drawn from A to T bisects CD. You'll also learn how to create an interactive...

Construct a copy of a line segment in this interactive exercise.

When a line intersects a circle in exactly one point the line is said to be tangent to the circle or a tangent of the circle.

Learn the four categories of theorems that have to do with lines and angles.

This site gives some examples of line reflection transformations. Includes coordinate graphs to show reflections of lines and shapes.

[Free Registration/Login may be required to access all resource tools.] Determine the formula for finding the coordinates of a point on a line segment.

Solve two problems that apply properties of tangents to determine if a line is tangent to a circle.

Solve two problems that apply properties of tangents to determine if a line is tangent to a circle.

If you want to plant a class garden, this is a great resource for combining geometry, Native American studies, and rocks.

[Free Registration/Login may be required to access all resource tools.] This study guide reviews the terminology for circles (tangent, arcs, central angles) and the equation for a circle.

This fourth-grade geometry lesson teaches the definitions for a line, ray, angle, acute angle, right angle, and obtuse angle. We also study how the size of the angle is ONLY determined by how much it has "opened" as compared to the whole...

Use this site for two short lesson plans regarding Euclidean and Spherical lines. Intersecting and parallel lines are discussed. The lesson contains activities for two days of class.

Explore reflection symmetry in some different shapes.

A "convention" is "just the way a thing is done!". This reference material lists some common conventions (notational assumptions) for geometry and trigonometry.

Hyperbolic Geometry is discussed here with specifics on the lines in this geometry. The equations of the lines are represented as well as a desription of the lines. The site has links to other non-Euclidean Geometries.

Learn about the tangent definition in geometry, tangent geometry, tangent to a circle, tangent line equation. Check-out the solved examples for better understanding and try your hand at the tangent line calculator or solving a few...

This lesson focuses on rigid transformations, a specific set of rules that convert one geometric figure into another one. There are many different types of transformations, like reflections or rotations. It provides several practice...

In this video segment [3:25] from Cyberchase, a plant expert shows Bianca the patterns and symmetry found in nature.

Defines parabolas, their properties, gives parametric equations, tangent line in a point D of a parabola, etc.