The Geometer’s Sketchpad
®
for TI-89, TI-92 Plus, and
© 2000-2002 KCP Technologies, Inc.
58
Voyage™ 200 PLT User Guide and Reference Manual
To construct a point on an object, first select an object (such as a segment
or circle) on which to place the point. Then press
…
Construct:
¨
Point
on Object. Sketchpad constructs and selects a randomly positioned point
on the selected object. To construct points on more than one object
simultaneously, select multiple objects before choosing Point on Object.
Before
After
A point constructed on an object may be dragged anywhere along that
object’s path. When you animate a point constructed on an object (see
About Animation, page 55), the point moves along the object’s path.
Points may be constructed on the following paths:
Path Object
Location of Point
1. Segment, Ray, Line,
Axis, Circle, Locus
of Points, Function
Plot
Along the object
2. Polygon Interior
Along the polygon’s perimeter
3. Circle Interior
Along the circle’s circumference
To construct the midpoint of a segment, first select a segment. Then press
…
Construct:
©
Midpoint. Sketchpad constructs and selects the
midpoint of the selected segment. To construct multiple midpoints
simultaneously, select multiple segments.
Before
After
…
Construct Menu
The
…
Construct menu contains commands for many useful
compass and straightedge constructions, including many you
can make using the tools. Each command requires specific
selections to make it available. These selections and other
details about each command are described in this section.
Point on Object
You can also construct
points on objects with the
Point tool—see Constructing
Points on Objects (page 27).
A path is the directed
geometric extent of an
object or object perimeter.
Not all objects are paths.
(For instance, points have
no dimension or extent, so
points cannot be paths.)
Midpoint
