### Home > INT2 > Chapter 10 > Lesson 10.2.4 > Problem 10-97

10-97.

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

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

Recall that a whole circle is

. In the diagram at right, what are

and if?Refer to the Math Notes in this lesson.

Notice the relationship between

and.In

at right, andunits. What areand 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.