The Geometer’s Sketchpad
®
for TI-89, TI-92 Plus, and
© 2000-2002 KCP Technologies, Inc.
68
Voyage™ 200 PLT User Guide and Reference Manual
2. Press
†
Transform:
m
Translate.
3. Press
ƒ
to switch to polar
vector entry, if Polar is not
already active (capitalized).
Then enter numbers into the
dialog box fields to describe a
vector 2 cm in length at an angle
of 45°.
4. Press
¸
to complete the
translation. Sketchpad
constructs and displays the
image of your selection,
translated by 2 cm at 45° from
the horizontal.
To construct the rotated image of an object or objects, first mark a point as
the center of rotation (see Mark Center, page 65). Then select the pre-
image object(s) and press
†
Transform:
n
Rotate. Sketchpad displays
the Rotate dialog box.
In the dialog box, enter the angle of rotation. You may enter a constant
angle (such as 90°) or a marked angle if you’ve marked an angle
previously (see Mark Angle, page 65). Press
¸
to complete the
rotation.
To construct the dilated image of an object or objects, first mark a point as
the center of dilation (see Mark Center, page 65). Then select the pre-
image object(s) and press
†
Transform:
o
Dilate. Sketchpad displays
the Dilate dialog box.
In the dialog box, enter the ratio of dilation. You may enter a constant ratio
(such as 1/2), or a marked ratio or scale factor if you’ve marked one
previously (see Mark Ratio/Scale Factor, page 65). Press
¸
to
complete the dilation.
To construct the reflected image of an object or objects, first mark a
segment, ray, line, or axis as the mirror of reflection (see Mark Mirror,
page 65). Then select the pre-image object(s) and press
†
Transform:
Ñ
Reflect. Sketchpad immediately constructs and displays the image of
the selected objects reflected about the marked mirror.
Rotate…
Remember: if you’ve
already marked a center,
you don’t need to mark it
again each time you rotate
or dilate.
You can also type a brief
mathematical expression for
your angle such as 360/5.
Dilate…
Reflect…