TI-83 Plus Activities 590
6. 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 p62 (the area of a circle with radius 6), which is
approximately 113.097.
7. 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 pB2.
Now graph the equation to see visually how the area changes as the
number of sides gets large.
8. Press z. Select the default mode settings.
9. Press p. Set the viewing window.
Xmin=0 Ymin=0 Xres=1
Xmax=200 Ymax=150
Xscl=10 Yscl=10
10.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.