Purple Math
Purplemath: Quadrants and Angles
Explains how to model angles in the x,y-plane, and demonstrates how to extend the concept of trig ratios to angles larger than 90 degrees.
Ministry of Education and Employment of Spain
Red Escolar: Un Triangulo Sorprendente
In Spanish. Different activities which involve the following concepts: right triangles, perpendicular lines, classification of triangles, area of a square and Pythagorean theorem.
University of Georgia
University of Georgia: Inter Math: Coordinate Plane
This site provides a definition and examples of a coordinate plane.
National Council of Teachers of Mathematics
The Math Forum: Analytic Geometry Formulas
This site from The Math Forum defines and explains, with examples, analytic geometry. Content includes a focus on one, two, and three dimension analytic geometry. Links are also provided for additional information.
Doina Popovici
Math Play: Pythagorean Theorem Jeopardy Game
This jeopardy-style game will have students calculate the sides of a right triangle by using the Pythagorean Theorem.
Learning Wave Communications
Learning Wave: Algebra, Section 2
The basic concepts of graphing are covered on this site, including points, slopes, equations of lines, and y-intercept. A quick discussion on the Pythagorean Theorem is also concluded. Several practice and application problems are...
Ducksters
Ducksters: Kids Math: Pythagorean Theorem
Understand how the Pythagorean Theorem can help us solve the lengths of a triangle. Learn how it works, terms, tricks, and examples on this site.
Free Math Help
Free Math Help: Distance Formula
The resource explores the distance formula. The lesson consists of a definition, formula, and detailed examples.
Free Math Help
Free Math Help: Trapezoids
The lesson discusses trapezoids. The resource consists of an explanation, diagrams, and practice problems with solutions.
Teaching Treasures Publications
Teaching Treasures: Year Eight Nine Math (Measurement)
Display your knowledge of Pythagoras theorem, pi, measurement, and algebra using this interactive worksheet. Answers can be accessed immediately and help links are provided for learners who may have difficulty grasping these concepts....
Doina Popovici
Math Play: Pythagorean Theorem Game
Find the unknown side in the right triangle using the Pythagorean theorem in this online game.
ClassFlow
Class Flow: Graphing Coordinates
[Free Registration/Login Required] In this lesson, students will learn step by step how to graph coordinates on a coordinate plane.
Math Is Fun
Math Is Fun: Introduction to Coordinates
What are coordinates? How do you plot coordinates? Find the answers to these questions and others, and follow links to learn more about Cartesian coordinates and to work with an interactive Cartesian coordinate tool.
University of Cambridge
University of Cambridge: Nrich: A Cartesian Puzzle
This one page website lets you practice plotting points on the coordinate grid. See if you can find the missing coordinates to complete the shapes. When you are finished the solutions are only a click away.
Shmoop University
Shmoop: Basic Geometry: Area Formulas
The geometry resource investigates the area of polygons, triangles, circles, and squares. Formulas, examples, and practice exercises are included.
Shmoop University
Shmoop: Basic Geometry: Pythagorean Theorem
Students learn about the Pythagorean Theorem. Notes, practice problems, and examples are included in the geometry resource.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Proving the Pythagorean Theorem
This Ask Dr. Math site explains how to prove the Pythagorean Theorem. Dr. Math gives three variations for proving the theorem.
Math Is Fun
Math Is Fun: Pythagorean Triples
Students investigate the sets of whole numbers that are Pythagorean triples. A definition and examples are included.
Other
Ron's Web Site: Distance Formula
This resource defines the distance formula, gives an example, and provides three practice problems with solutions.
National Council of Teachers of Mathematics
Nctm: Figure This: Nctm Math Challenge Three Squares (Pdf)
If you think you can handle the Pythagorean Theorem, then this is a math challenge you should try. Explore geometric relationships and measurement in this one page activity from the NCTM Math Challenges for Families series.
Purple Math
Purplemath: The Midpoint Formula
This lesson from Purplemath demonstrates how to use the Midpoint Formula and shows typical problems using the Midpoint Formula.
Walter Fendt
Walter Fendt: Pythagorean Theorem (2)
A short interactive activity to visualize the Pythagorean Theorem.
Cool Math
Coolmath: Intro to Graphing the Cartesian (Rectangular) Coordinate System
A quick tutorial on the basics of the Cartesian (rectangular) coordinate system.
Educaplus (Jesús Peñas Cano)
Educaplus: Coordenadas Polares Y Cartesianas
This activity will help you to visualize the representation of a point in a Cartesian plane and in a polar plane.