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3.
Choose Intersection Point(s) from the Points toolbox.
4.
Point to one of the perpendicular bisectors (the cursor
message This line appears) and click once.
The line changes to marquee outline.
5.
Point to the other perpendicular bisector. After the
cursor message appears, click once.
The first line returns to solid, and a point at the
intersection of the two lines appears. This point of
intersection is known as the circumcenter of the triangle.
The vertices of the triangle are basic points. The triangle
is an independent object because its existence depends
only upon basic points. The perpendicular bisectors are
dependent objects because their existence depends upon
independent objects (the sides of the triangle). The
circumcenter is a dependent object because it was
created using dependent objects (the perpendicular
bisectors).
In Example 5, we will first create a circle, and then inscribe a triangle. You can move the circle by
dragging its center point or modify it by dragging its circumference. The triangle cannot be moved.
However, you can modify it by dragging any one of its vertices around the circle.
Example 5: Inscribing a triangle in a circle
1.
Choose Circle from the Curves toolbox.
Move the # to any place in the drawing window and click
2.
once.
A flashing point appears.
3.
Move the cursor away from the flashing point.
A circle appears with the flashing point as its center.
Click again to finish constructing the circle.
Note: The flashing point changes to solid to indicate the
construction is completed.
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© 1997, 1999 Texas Instruments Incorporated
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Chapter 1: Learning the Basics
1-15
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