20
Chapter 1: First Steps
Carry out the change by leaving the dialog box with
(_OK_)
.
This font is useful for demonstration purposes, especially when using an overhead projector with
a display palette. For personal work the small font may be preferable. Therefore, switch back to
it and try a different color instead.
To undo the change of expression size, select
Options>Display>Font of All Expressions
again, then change the text size back to small by clicking on the
Small
radio button (left
picture.) Prepare for changing the font color by opening the
Color
selection menu.
Select a color of your choice by clicking on it, then close the dialog with
(_OK_)
.
Earlier you entered
π
via the Greek or Math Symbol Toolbar. There are several methods for
entering special constants such as
π
, the base of the natural logarithm
e
, or the imaginary unit
i
.
To enter a sum of three
π
‘s, first move the focus into the entry line using
(F2)
. Enter the first
π
from one of the two symbol toolbars, the second one by typing
pi
, and the third one as
(Ctrl)
+
(P)
. (The pluses in between are all entered via the keyboard.)
These are the three methods of entering the number
π
. While some look different in the entry
line, they all look and mean the same once they are entered:
Conclude the input of the sum of three
π
‘s with
(¢)
.
