Operation Manual

Chapter 17: Activities 321
Enter N=8. To find the distance B, move the cursor onto B, and then press ƒ \. Find B for N=9,
and then for N=10.
Find the area given
B=6, and N=10, 100, 150, 1000, and 10000. Compare your results with p6
2
(the area
of a circle with radius 6), which is approximately 113.097.
6. Enter
B=6. To find the area A, move the cursor onto A, and then press ƒ \. Find A for
N=10, then N=100, then N=150, then N=1000, and finally N=10000. Notice that as N gets large, the
area
A approaches pB
2
.
Now graph the equation to see visually how the area changes as the number of sides gets large.
7. Press z. Select the default mode settings y L7 2 2.
8. Press p. Set the viewing window.
9. Press o. Turn off all functions and stat plots. Enter the equation for the area. Use
X in place of N.
Set the graph styles as shown.
Xmin=0
Xmax=200
Xscl=10
Ymin=0
Ymax=150
Yscl=10
Xres=1