Texas Instruments TI-84 Plus Manual Book page 511

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
Xmax=200
Xscl=10
10. Press o. Turn off all functions and stat plots. Enter the equation for the area. Use
in place of . Set the graph styles as shown.
N
11. Press r. After the graph is plotted, press
Í. Press
188
which is approximately 113.097.
Chapter 17: Activities
Ymin=0
Ymax=150
Yscl=10
Í. Notice that as
Y2=
Xres=1
Í to trace to
100
increases, the value of
X
2
p
(the area of the circle) is a horizontal
B
. Press
X=100 150
converges to p6
Y
508
X
2
,