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366
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(?)aaA6(g)5(:)
Surface Area S ............ !9d*aAx6(g)5(^)
Volume V ..................... !9c/bc*aAMd
Compare this with the program for calculating the surface area and volume of a
regular octahedron.
Length of One Side A .. !W4(?)aaA6(g)5(:)
Surface Area S ............ c*!9d*aAx6(g)5(^)
Volume V ..................... !9c/d*aAMd
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)
20 - 8 Editing File Names and Program Contents
eeeeDD
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