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10-67.

is a regular pentagon inscribed in , meaning that each of its five vertices lie on the circle.

  1. Draw a diagram of and on your paper.

  2. What is ? How did you determine your answer?

    Recall that the sum of the interior angles of a regular pentagon is .

  3. What is ? What relationship did you use?

    Notice that is one-fifth of the circle.

  4. What is m? Show more than one way to calculate this measure.

    What is the relationship between and the arc in question?