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Home > GC > Chapter 7 > Lesson 7.2.1 > Problem 7-50

7-50.
  1. Jamal used a hinged mirror to create a regular polygon like he did in Lesson 7.1.4. Homework Help ✎

    1. If his hinged mirror formed a 72° angle and the core region in front of the mirror was isosceles, how many sides did his polygon have?

    2. Now Jamal has decided to create a regular polygon with 9 sides, called a nonagon. If his core region is again isosceles, what angle is formed by his mirror?

5 sides

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