A comprehensive guide for learning all about plane shapes with definitions, properties, types, solved examples, and practice questions.

In a coordinate proof, geometric statements using algebra and the coordinate plane.

This robust lesson plan for upper elementary and middle school grades introduces the concepts for lines, rays, line segments, and planes. Resources are linked to it and ready for your use.

A complete reference guide to coordinate geometry. It provides definitions and examples that enhance further explanation. Includes links to related topics.

This study guide on Geometry covers some key vocabulary, drawing and labeling diagrams, describing geometric figures, and basic postulates for points, lines, planes, and intersections. It is available for download with free registration.

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

Site that focuses on planar pattern and transformations within geometry. It also identifies different kinds of symmetry.

This study guide on lines and angles covers key terminology; line notation; parallel, perpendicular, and skew lines; and postulates and theorems about lines. It is available for download with free registration.

[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn how to translate a figure. They examine guided notes, review examples, watch instructional videos, and try practice problems.

Students can review basic geometric terms using these self-check, multiple choice questions. Three levels of questions are provided.

[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.

Explore some problems you can solve with your knowledge of triangles and trigonometry.

Explore finding and measuring perimeter of figures.

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 is an inquiry instructional activity used to review Algebra 1 objectives by applying them to geometry concepts. Students explore the properties of quadrilaterals and classify them by definition. This instructional activity can be...

This site from the University of Saskatchewan provides an explanation of similar triangles, the Pythagorean theorem, and the distance between arbitrary points in a plane. Example problems for each of these concepts are provided.

Assess learning of polygons and perimeters with this interactive multiple choice practice and quiz activity. Click the question mark for hints.

This task challenges a student to demonstrate understanding of the attributes of two-dimensional shapes.

Explore pentominoes by determining congruent and non-congruent shapes.

A collection of circular objects will be used to explore circumference and diameter of circles.

The purpose of this lesson is to help students apply math concepts concerning similar triangles and trigonometric functions to real life situations. The students learn how to take these concepts and use them to find measurements of...

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

Use this calculator to find the unknown angles in a right triangle using the Pythagorean Theorem. Once you know the sides you can calculate the perimeter, semiperimeter, area, and the altitudes.

Use this calculator to find the sides, perimeter, area, semiperimeter, and altitude of an isosceles triangle.