Casio ClassPad 101 User's Guide download pdf (Page 169)

Chapter 8: Geometry Application 169

“

t0” and “t1” specify the range of movement of point A on side CD. The initial default values are t0 = 0 and

t1 = 1. During animation, the length of CD is considered to be one unit. The default values specify that

movement of point A is from start point C (point where length equals 0) up to end point D (point where length

equals 1).

Changing the value of

t0 to 0.5, for example, causes point A to move from the middle of side CD to point D.

Changing the value of t0 to −1, causes point A to begin at a point outside side CD (in this case, at a point a

distance equivalent to the length of side CD) and ending with point D.

Traces:

This item shows the specified trace point. Tapping [Remove] cancels the trace point setting.

3. While the lower window is active, tap C to close the animation editing window.

u To view an animation table

Note: The steps below continue from the procedure under “To trace a locus of

points”.

1. Tap line segment AB, which connects point A with apex B, to select it.

2. Tap u on the toolbar to display the measurement box.

• This displays the measurement of line segment AB in the measurement

box.

3. Tap # next to the measurement box.

• This displays a table showing the length of line segment AB for each

animation step in the bottom half of the screen.

4. Next, let’s add a column to the table that shows the area of triangle ABE at

each step. Perform the steps below.

(1) Draw a line segment that connects point A with apex E.

(2) Select line segment AB, line segment AE, and side BE.

(3) Tap # next to the measurement box.

This adds a column that shows the area of triangle ABE at each step.

(As can be seen, the area of triangle ABE does not change even when

point A moves.)

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Casio ClassPad 101 User's Guide Page 169