Make the given changes in the indicated examples of this section, and then solve the resulting problems.

In Example 3(a), change 17.5% to 18.5%.

Data from Example3(a)

Showing that 17.5% of high school students send at least 200 text messages per day on a pie chart of radius 8.50 cm means that the central angle of the sector is 63.0° (17.5% of 360°). The area of this sector (see Fig. 8.37) is

-0 in radians A = (63.0)) (8.50) = 39.7 cm