Icon

Icon Name

This icon appears when this

Tapping this icon displays:

Lockable

is selected:

 

 

 

 

 

 

 

 

 

e

Congruence

Two line segments

Whether line segments are the

Yes

same length

 

 

 

 

 

 

 

 

 

Incidence

Point and a line, arc, circle or vector

Whether a point is on the line/

6

Point and a function, curve, or

Point on curve

ellipse

curve

Yes

F

Rotation angle

Two points created by

Angle of rotation

[Rotation]

 

 

 

 

 

Two points (like point A and

 

2

Scale of dilation point A’) on a figure created by

Scale of dilation

 

 

[Dilation]

 

*1

*1

An object that includes text or

Editable text used to name the

u Text icon

an object that can be named

selected image

No

*1 The value in the measurement box is always locked while this tool is selected.

uTo view the measurements of a line segment

1.Draw a line segment.

2.Tap uon the toolbar to display the measurement box.

3.Select the line segment.

•This displays the length of the line segment.

4.Tap the down arrow next to the measurement box to cycle through other measurements.

•In the case of the line segment, for example, you can view its length, slope, direction, and equation.

Specifying and Constraining a Measurement of a Figure

The following example shows how to specify and constrain (fix) an angle of a triangle. By “constraining a measurement” we mean that it becomes fixed. For example, constraining (fixing) angle B of triangle ABC at 90 degrees will cause angle B to remain at 90 degrees regardless of where the apex is moved.

uTo specify and constrain the measure of an angle of a triangle*

1.Draw the triangle, and then select its side AB and side BC.

2.Tap uon the toolbar to display the measurement box.

• This displays the measure of angle B in the measurement box.

Chapter 8: Geometry Application

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