CK-12 Foundation
Ck 12: Geometry: Basics of Geometry Study Guide
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.
CK-12 Foundation
Ck 12: Interactive Geometry: 8.8 Secant Lines to Circles
Learn about a line that intersects a circle in two points is called a secant line.
PBS
Pbs: Beating Usain Bolt
Use mathematics to determine what is required to beat world champion Usain Bolt in a 200-meter race. This video focuses on systems of equations that are visualized by completing a table of values and looking for a point of intersection...
Wolfram Research
Wolfram Math World: Triangle Centroid
This site from MathWorld gives a diagram of a triangle with its centroid labeled. The site details how to find the centroid with links to the key terms. The site details many other interesting properties of the triangle centroid.
Other
University of Edinburgh: Glossary of Introductory Computer Graphics Terms
This website, from the University of Edinburgh, provides a lengthy glossary of computer graphics terms written by Olin Lathrop, author of "The Way Computer Graphics Work". This site provides simple definitions of basic terms; no graphics...
Khan Academy
Khan: Lesson 5: Relationships Among Linear Equations, Lines in Coordinate Plane
This lesson focuses on the relationship between algebraic, graphical, and contextual expressions of linear equations.
Math Planet
Math Planet: Pre Algebra: Geometry Fundamental Statements
Provides examples and a video lesson that introduce fundamental statements of geometry.
Common Core Sheets
Common Core Sheets: Expressions & Equations 8.ee.8a Worksheets
Teachers can assess students' knowledge of expressions and equations with these printable worksheets. You can even create your own learning exercise.
Other
Nearpod: Systems of Equations & Solutions
In this lesson on systems of equations, 8th graders will learn how to solve systems by graphing and examine graphs to determine if a system has one solution, infinite solutions, or no solution.
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Iniciacion a La Programacion Lineal
In Spanish. Practice how to find the value of linear functions at the point of intersection and learn how to locate the maximum and minimum value with this interactive activity.
Math Graphs
Houghton Mifflin: Math Graphs: Vertical Line Test 27 [Pdf]
The practice exercise uses a test to determine if any vertical lines intersect with a graph at more than one point. The resource consists of an enlarged printable version of a graph available in PDF format.
Math Graphs
Houghton Mifflin: Math Graphs: Vertical Line Test 28 [Pdf]
The practice exercise uses a test to determine if any vertical lines intersect with a graph at more than one point. The resource consists of an enlarged printable version of a graph available in PDF format.
Wolfram Research
Wolfram Math World: Orthocenter
This site from MathWorld provides a diagram of a triangle with its orthocenter labeled. The site details how to find the orthocenter with links to the key terms. The site details many other interesting properties of the triangle...
Math Open Reference
Math Open Reference: Concurrent Lines
Learn about concurrent lines with this helpful reference tool. Provides a detailed definition and example.
Curated OER
Educational Technology Clearinghouse: Maps Etc: Nevada, 1903
A map from 1903 of Nevada showing counties and county seats, principal cities and towns, mountain ranges, and rivers. "Nevada, one of the most western of the States of the American Union, was formed from a portion of the territory...