Geometry

Activity 7: The Dolphin

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7.Set up the xyLine plot (connected line graph).

a.Access the STAT PLOTS menu.

-e (above the & key)

b.Select Plot 1. b

c.With the cursor blinking on the word On, select it. b

d.Move to Type and select the xyLine plot (first row, second from left Ó).

# " b

e.Move to Xlist and select L1.

# - v b

f.Move to Ylist and select L2.

# - v # b

g.Move to Mark and select the . (dot) as the mark for the xyLine plot.

# " " b

h.Set up the viewing window to match the part of the coordinate grid that you used.

'

The values shown in the screen at the right are the standard default values (( 6:Zstandard). For more information, see “Setting the Window Format” and “Defining Window Values” in the Function Graphing chapter of the TI-73 Guidebook ￿.

i.Turn on the grid.

-g # " b

j.Make sure the axes are turned on.

-g # # b

8.Display the picture of the dolphin.

*

You may want to link the student picture to the viewscreen calculator to display on the overhead. If you want to turn off the grid, press

- g # b.

Your students should learn how to set up the WINDOW, but you can use

(7:ZoomStat to get the ideal WINDOW values.

If a student gets a dim mismatch error, it means that the 2 corresponding lists have a different number of elements. You may also need to check the Y= editor to clear or turn off any functions (& :).

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