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• Conic Graphing does not allow for continuous tracing. For
example, after you trace an entire circle, the tracing stops. You
can then press the opposite direction arrow to trace the object
in the opposite direction. Using Free Trace Conic Graphing does not have a free trace feature. However,
you can use a zoom option to simulate a free trace.
1. Graph a conic section.
2. Press T. 3. Select Zoom In, Zoom Out, or Zbox.
A free cursor is on the screen. TI-83 Plus Conic Graphing Page 23 4. Use _, `, a, h to move the cursor around on the
5. Press R to escape from the graph.
Note Zoom In, Zoom Out, or Zbox options place a free cursor on the
screen because each is waiting for you to position the cursor and
press ¯ so that the zoom can be carried out. Do not press
¯ unless you want to carry out that zoom feature.
Press V to clear the cursor and coordinates from the screen
without exiting the graph. TI-83 Plus Conic Graphing Page 24 Finding Characteristics of Conic Sections
After you enter the values for each of the required variables, you
can display information for the conic equation. Press e
? to display the solution. e? Note You can only press e ? to display the solution from the
equation screen. TI-83 Plus Conic Graphing Page 25 Graphing Examples
mode A circle is the set of points
in a plane whose distance
from a given fixed point in
the plane is constant. The
fixed point is the center of
the circle; the constant
distance is the radius. Function (X-2) 2 + (Y-2) 2 = 25: Parametric Equations
(X1H) 2 + (Y1K) 2 = R 2
AX2 + AY2 + BX + CY+ D = 0 X = R cos (T) + H
Y = R sin (T) + K Center (2,2)
Radius 5 Polar R = 2A cos (T)
R = 2A sin (T) A 2 = B 2 + R 2 1 2BR cos
(T1b) TI-83 Plus Conic Graphing Page 26 Example
Graph an arc of a circle with radius = 8 whose center is at (0,0),
using parametric mode.
Note To complete this exercise, you need to set your calculator to
radian mode before you start the Conic Graphing application. To
1. Press ]. 2. Move the cursor to Radian, and press ¯.
3. Press s to exit the mode screen. Steps: 1. Start the Conic Graphing application.
2. Select CIRCLE from the CONICS main menu. 3. Press ] to display the CONIC SETTINGS screen.
4. Select PAR to change the mode to parametric.
5. Select MAN so that you can manually change window
settings. TI-83 Plus Conic Graphing Page 27 6. Select ESC to return to the CIRCLE screen.
7. Select the equation X = R cos (T) + H
Y = R sin (T) + K 8. Enter the values for H, K, and R [(0,0) and 8], as defined in
9. Press T to display the CONIC ZOOM screen. 10. Select Zoom Conic so that the circle will be displayed
correctly. (Otherwise, the circle may look like an ellipse.) The
graph of the circle is drawn. 11. Press S to change the CONIC WINDOW settings.
12. Change the following parameters:
Tmin = 0
Tmax = (In degree mode, Tmax = 90. To change to degree
mode, you must exit Conic Graphing.)
TI-83 Plus Conic Graphing Page 28 13. Press V t...
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- Fall '13