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Lines & Angles

lines and angles properties sum of angles in triangle math video tutorials interactive applets

  • Geometric Objects
  • Types of angles
  • Protractor Practice
  • Angles in Polygons
  • Angles in a star
  • Sum of the angles in a triangle
  • Why is the sum always 180°?
  • Why is the sum always 180°? (A different look.)
  • Missing angle in a triangle
  • Complementary Angles - the definition
  • Complementary Angles - find the missing angle
  • Supplementary Angles - the definition
  • Supplementary Angles - find the missing angle
  • Vertical Angles
  • Find the missing angles with a triangle on a line
  • Angles on a line
Geometric Objects ›
  • Lines and Angles
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