Online Math Dictionary: E
Easy to understand math definitions for K-Algebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!
Edge The edges of a polygon are the outside boundaries. In thesquare on the right, you can see four edges. In a polyhedron, like the dodecahedron on the right, an edge is where two faces meet. The edges are the yellow lines. |
![edges of a square and dodecahedron](/sites/default/files/page_images/reference/dictionary-edge.gif)
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![red line](/sites/default/files/page_images/reference/line-red.gif)
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Ellipse There's an easy definition for an ellipse and a harder algebra definition. Here's the easy one: An ellipse is a stretched out circle.
For the algebra definition, check out.Coolmath Algebra Ellipses |
![ellipse](/sites/default/files/page_images/reference/dictionary-ellipse.gif) |
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![red line](/sites/default/files/page_images/reference/line-red.gif)
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Ellipsoid An ellipsoid is a three dimensional ellipse. Imagine putting a line through the longest part of an ellipse and spinning it. This would give you an ellipsoid. |
![ellipsoid](/sites/default/files/page_images/reference/dictionary-ellipsoid.gif)
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![red line](/sites/default/files/page_images/reference/line-red.gif)
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Empty Set An empty set is the same as a "null set." An empty set is a set with no members (or elements.) The symbol for the empty set is on the right. It can also be written as an empty set of set brackets:
{ }
Putting the empty set symbol inside the set brackets is a bad thing... But, is a common mistake, so don't do it! |
![empty set symbol](/sites/default/files/page_images/reference/dictionary-empty-set.gif)
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