National Council of Teachers of Mathematics
Nctm: Illuminations: Triangle Classification
Use this applet to show how the placement of the third vertex of a triangle affects the classification of that triangle.
Math Open Reference
Math Open Reference: Vertex
Learn about arc length with this handy reference guide. Provides a detailed definition and examples enhance further explanation. Includes links to related topics.
Quia
Ixl Learning: What Is an Angle?
Brush up on your math skills relating to what is an angle then try some practice problems to test your understanding.
Math Words
Math words.com: Altitude of a Triangle
This site provides a definition of what the altitude of a triangle is. It also provides a diagram.
Math Words
Math words.com: Vertices, Ellipse
Basic definition for the vertex of an ellipse. Shown in a pictoral example as well.
Math Words
Math words.com: Vertex, Parabola
The definition is given for what the vertex is. An example illustration is also given.
Quia
Quia: Spanish 2 Final Exam Review 2003
You can assess your knowledge of the various parts of angles and lines at this web site. You respond to a series of questions. A running total is visible showing the number of correct responses you have as you work your way through the...
Curated OER
Ear Cutting for Simple Polygons: Introduction
This site gives the definitions for various polygon-related material.