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Constructing Objects
4.
Choose Triangle from the Lines toolbox.
Move the # to any point of the circle (the cursor message
5.
On this circle appears), and click once.
6.
Move the cursor to a second and third point on the
circle, clicking once at each point.
A triangle becomes inscribed in the circle.
7.
Choose Pointer from the Pointer toolbox.
Move the ! cursor near the center point (the cursor
8.
message This point appears).
Press and hold down the mouse button until the %
appears, and drag the center point around the drawing
window.
Note: The radius of the circle remains unchanged.
Move the ! near the circumference of the circle (the
9.
cursor message This circle appears).
Press and hold down the mouse button until the %
appears, and drag the circumference.
Note: The center point of the circle remains fixed while
the radius changes, and the vertices of the triangle stay
on the circle.
10. Move the ! near a vertex of the inscribed triangle (the
cursor message This point appears).
Press and hold down the mouse button until the %
appears, and then drag the point.
Note: The point can only be moved along the circle.
If you move the pointer while creating points, Cabri Geometry II reverts to dragging. This feature
anticipates your intent to modify your construction without requiring you to return to the Pointer
toolbox. However, it can create some confusion if you are creating points quickly and
inadvertently move the pointer while pressing the mouse. In this case, a point will not be created.
1-16
Chapter 1: Learning the Basics
(Continued)
On this circle
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© 1997, 1999 Texas Instruments Incorporated
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