380
Use TETRA as the file name.
Length of One Side (A)
Surface Area (S)
Volume (V)
A
7 cm
cm
2
cm
3
10 cm
cm
2
cm
3
15 cm
cm
2
cm
3
The following are the formulas used for calculating surface area S and volume V
of a regular tetrahedron for which the length of one side is known.
2
S = 3 A
2
,
V = –––– A
3
12
Use the following key operations when inputting the program.
Length of One Side A ..
!W4
(?)
a
a
A
6
(
g
)
5
(:)
Surface Area S ............
!9
d*
a
A
x6
(
g
)
5
(
^
)
Volume V .....................
!9
c/bc*
a
A
M
d
Compare this with the program for calculating the surface area and volume of a
regular octahedron.
Length of One Side A ..
!W4
(?)
a
a
A
6
(
g
)
5
(:)
Surface Area S ............
c*
!9
d*
a
A
x6
(
g
)
5
(
^
)
Volume V .....................
!9
c/d*
a
A
M
d
As you can see, you can produce the TETRA program by making the following
changes in the OCTA program.
• Deleting
c
*
(underlined using a wavy line above)
• Changing
d
to
b
c
(underlined using a solid line above)
Let’s edit OCTA to produce the TETRA program.
1. Edit the program name.
6
(
g
)
2
(REN)
TETRA
w
2. Edit the program contents.
2
(EDIT)
21 - 8
Editing File Names and Program Contents
eeee
DD
Содержание CFX-9970G
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