Casio CLASSWIZ CG Software User's Manual page 170

Specifying and Locking a Measurement of an Object
The following example shows how to specify and lock an angle of a triangle. For example, locking ∠ACB of
△ABC at 90 degrees causes ∠ACB to remain at 90 degrees regardless of where the vertex is moved. In the
example below, the S > [Angle] setting is set to "Degree".
To specify and lock the measure of an angle of a triangle
1. Draw a triangle, and then select its side AC and side BC.
2. Press V to display the measurement box.
• This displays the measure of ∠ACB in the measurement box.
• At this time, the icon to the right of the measurement box is
(unlocked).
3. Input 90 into the measurement box and press E.
• This specifies and locks the measure of ∠ACB at 90
degrees.
• This causes the icon to the right of the measurement box to
change to (locked), indicating that the angle is locked.
4. Try moving vertex B (make sure ∠ACB is locked at 90 degrees).
(1) Press b twice to hide the measurement box.
(2) Press a to deselect all objects.
(3) Move the pointer to vertex B and then press X. See
information.
(4) Use the cursor keys to move vertex B to the location you want and press O.
• Vertex A moves so ∠ACB maintains 90 degrees.
Note
• Specifying any one of the following measurements for the first time in the file you are editing (or
immediately after an all-clear operation (T > [Edit] > [Clear All]) causes the resulting object to be
resized so it fits within the display area.
- Length of one side of a triangle
- Length of a line segment or vector
- Length of one side of a rectangle, square, polygon, or regular n-gon
- Circumference of a circle or length of an arc
View Window settings are reconfigured automatically so the size of the object on the display may
not appear to change very much. The following example shows what happens when the length of
the base of a triangle drawn with the initial default View Window settings (with a screen width of 10)
is changed to 50.
"To move an object" (page 159)
170
for more