text: • #### Circumscribed and Inscribed Circles and Polygons - Concept
  
  ##### Math›Geometry›Constructions
  How to define circumscribed and inscribed circles and polygons relative to each other.
  • #### Center and Apothem of Regular Polygons - Concept
  
  ##### Math›Geometry›Area
  How to define the apothem and center of a polygon; how to divide a regular polygon into congruent triangles.
  • #### Center and Apothem of Regular Polygons - Problem 1
  
  ##### Math›Geometry›Area
  How to find the length of an apothem in a regular polygon given a side length and the number of sides.
  • #### Central Angles and Intercepted Arcs - Problem 4
  
  ##### Math›Geometry›Circles
  How to find the measure of an arc created by the vertices of an inscribed regular polygon.
  • #### Using Sine to Calculate the Area of a Triangle - Problem 2
  
  ##### Math›Geometry›Basic Trigonometry
  How to calculate the area of a regular inscribed polygon given only the radius of a circle.
  • #### Using Sine to Calculate the Area of a Triangle - Problem 2
  
  ##### Math›Trigonometry›Basic Trigonometry
  How to calculate the area of a regular inscribed polygon given only the radius of a circle.
  • #### Using Sine to Calculate the Area of a Triangle - Problem 2
  
  ##### Math›Precalculus›Basic Trigonometry
  How to calculate the area of a regular inscribed polygon given only the radius of a circle.
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