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Home > CCG > Chapter 7 > Lesson 7.2.1 > Problem 7-55


Jamal used a hinged mirror to create a regular polygon like you did in Lesson 7.1.4.  

  1. If his hinged mirror formed a angle and the core region in front of the mirror was isosceles, how many sides did his polygon have?

    Use the formula: 

  2. Now Jamal has decided to create a regular polygon with sides, called a nonagon. If his core region is again isosceles, what angle is formed by his mirror?

    Use the formula given in hint (a) and solve for the unknown piece.