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  # Geometry
  
  Khan Academy, , Prof. Salman Khan
  
  Updated On 02 Feb, 19
  
  ##### Overview
  
  Contents:
  introduction to angles - Angles - Angles formed between transversals and parralel lines - Angles of parallel lines - The Angle Game - Similar triangles - Area and Perimeter - Circles: Radius, Diameter and Circumference - Area of a circle - The Pythagorean Theorem
  
  45-45-90 Triangles - Intro to 30-60-90 Triangles - 30-60-90 Triangles II - Heron's Formula the Proof of Heron's Formula - An inscribed angle is half of a central angle that subtends the same arc - Area of Inscribed Equilateral Triangle (some basic trig used) - Right Triangles Inscribed in Circles (Proof) - Area of Diagonal Generated Triangles of Rectangle are Equal
  
  ## Lecture 18: Herons Formula
  
  4.1 ( 11 )
  
  ###### Lecture Details
  
  Using Herons Formula to determine the area of a triangle while only knowing the lengths of the sides
  
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