Getting Started: Graphing A Circle - Texas Instruments TI-82 STATS Manual Book

Getting Started: Graphing a Circle

Getting Started is a fast-paced introduction. Read the chapter for details.
Graph a circle of radius 10, centered on the origin in the standard viewing window.
To graph this circle, you must enter separate formulas for the upper and lower
portions of the circle. Then use
make the functions appear as a circle.
mode, press o to display the
1. In
Func
editor. Press y ã
Y=
Í to enter the expression Y=‡(100NX
which defines the top half of the circle.
The expression Y=L‡(100NX
bottom half of the circle. On the TI-82 STATS,
you can define one function in terms of another.
To define
Y =LY
2
sign. Press  ~ to display the
VARS Y.VARS
select
1:Function
menu is displayed. Press
2. Press q
to select
6
quick way to reset the window variables to the
standard values. It also graphs the functions;
you do not need to press s.
Notice that the functions appear as an ellipse in
the standard viewing window.
3. To adjust the display so that each pixel
represents an equal width and height, press
q
to select
5
replotted and now appear as a circle on the
display.
4. To see the
ZSquare
p and notice the new values for
, , and
Xmax Ymin
3.2 Function Graphing
ZSquare
¹ „ ¡ ¤
100
ä
‡
2
) defines the
, press Ì to enter the negation
1
menu. Then press Í to
. The
FUNCTION
to select
1
6:ZStandard
. The functions are
5:ZSquare
window variables, press
.
Ymax
(zoom square) to adjust the display and
2
),
secondary
.
1:Y
1
. This is a
,
Xmin