Index to Videos

This page contains an index of all videos, broken down by subject area.


  • Video #201, Geometry vocabulary.  This video covers the definitions of the following concepts:  right angle, acute angle, obtuse angle, straight angles, adjacent angles, complementary angles, supplementary angles, vertical angles.
  • Video #202: Triangle Vocabulary.  This video covers the definitions of the following terms: Polygon; Triangle; Equilateral triangle; Isosceles triangle; Scalene Triangle; Acute Triangle; Right Triangle; Obtuse Triangle
  • Video #203: Triangle Theorems.  This video covers the following topics: Triangle angle sum theorem: The sum of a triangle’s angles equals 180 degrees; and Triangle inequality theorem: In any triangle, the sum of any two sides must be greater than the other side.

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