Operation Manual

DRAW
Operations 8-9
8208DRAW.DOC TI-82, Chapter 8, English Bob Fedorisko Revised: 02/09/01 12:23 PM Printed:
02/09/01 3:30 PM Page 9 of 16
Drawing Circles
While a graph is displayed, Circle( lets you define a circle on the graph using the
cursor. If a graph is not displayed, the instruction is copied to the Home screen.
Directly on a Graph
1. When a graph is displayed, select
Circle(
from the
DRAW DRAW
menu
(item
9
).
2. Position the cursor at the center of the circle you want to draw. Press
Í
.
3. Move the cursor to a point on the circumference. Press
Í
. The
circle is drawn on the graph.
To continue to draw circles, repeat steps 2 and 3. To cancel
Circle(
press
‘
.
Because this circle is drawn on the display and is independent of the
WINDOW
values (unlike the
Circle(
instruction, see below), it appears as a
circle.
From the Home Screen or a Program
Circle(
(
DRAW DRAW
item
9
) draws a circle with center (
X
,
Y
) and
radius
(these values can be expressions).
Circle(
X
,
Y
,
radius
)
Note: When the
Circle(
instruction is used from a program, the drawn
circle may not look like a circle because it is drawn with respect to the
current
WINDOW
values. For example, in the standard viewing
WINDOW
,
Circle(0,0,7)
displays: