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Review what you know about the angles and arcs of circles below. Homework Help ✎

  1. A circle is divided into nine congruent sectors. What is the measure of each central angle?

    Recall that a whole circle is .

  2. In the diagram at right, what are and if ?

    Refer to the Math Notes in this lesson.

    Notice the relationship between and .

  3. In at right, and units. What are and the length of ? What is the area of the smaller sector?

    What portion of the circumference is ?

    Use the same method as above to find the area of the smallest sector.