Chapter 8: Geometry Application 164
8-3 Using the Measurement Box
Tapping the u button to the right of the toolbar displays the measurement box. Tap t to return to the normal
toolbar.
Normal toolbar Measurement box
You can use the measurement box to view the measurements of a figure, to specify a measurement of a figure,
to fix a measurement of a figure, or to name a figure.
Viewing the Measurements of a Figure
The type of information that can be displayed in the measurement box depends
on the figure currently selected on the screen. The nearby screen shows
an example when a line segment is selected. You can change the display
information type by tapping one of the icons.
The following table describes the information that appears when you tap each icon, and explains when each
icon is available for selection.
Icon Icon Name
This icon appears when this
is selected:
Tapping this icon displays: Lockable
T
Coordinates A single point Coordinates of the point Yes
t
Distance/length
Two points on one figure or
two different figures, or a single
line segment or a vector
Distance between two points,
length of a line segment or
vector
Yes
Q
Slope
Single line, line segment, or
vector
Slope of the line, line segment
or vector
Yes
Y
Direction
Single line, line segment, or
vector
Direction angle of the line
(angle of inclination)
Yes
O
Equation
Any single line or line segment,
vector, circle, arc, ellipse or
any other figure (parabola,
etc.) drawn by a function
Function of the figure (using
rectangular coordinates)
Yes
5
Equation edit
Single parabola or any other
figure drawn by a function
Equation of the figure in the
function editing dialog box.
No
]
Radius Single circle or arc Radius of circle or arc Yes
3
Circumference Single circle Length of the circumference Yes
v
Perimeter Single polygon Sum of the lengths of the sides No
E
Area
Any three points, an arc,
ellipse, or polygon
Area No
Single circle Area Yes
Q
t
Angle Two line segments
Angle and its supplement
formed by the line segments
Yes
K
Tangency
Two circles or arcs, or a line
and circle
Whether two items are tangent Yes
