Online Math Dictionary: E

Easy to understand math definitions for K-Algebra mathematics
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 edge ellipse ellipsoid empty set equality equation equidistant equilateral triangle estimate even number expanded notation exponent exponential exterior angle

 EdgeThe 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.  EllipseThere'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  EllipsoidAn 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.  Empty SetAn 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! 