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- TrigMaster is very easy to use, but is only available from the Shell. If you
- are a novice at the command line interface don't worry. There is no better
- time to learn than the present. This program doesn't write or delete
- anything in anyway, therefore you cannot damage your system by experimenting
- with it. Simply open a Shell by double clicking the icon on your system
- disk, resize it to full page via the gadgets, and read on.
-
- The original idea behind this type of program came from an old Hewlett
- Packard programmable calculator my father used for highway surveying. It
- utilized the exact format of TrigMaster, so on the off chance you used one of
- those old dinosaurs this will be review. For others (probably everyone), the
- command line for TrigMaster is very easy to use.
-
- The first parameter is the qualifier string. This is a three letter string
- of 'A's or 'S's. They denote what the following three parameters will mean
- to the program. An 'A' stands for an angle, and an 'S' stands for a side.
- These can be in any combination (except AAA). The following triangle may
- help to relieve some of the confusion.
-
-
-
-
- A
- /\
- / \
- b / \ c
- / \
- /________\
- C a B
-
- Triangles have six basic values in Trigonometry. They are each of the angles
- represented by capital letters, and each of the sides represented by the
- lower case letter of the opposite angle (as shown). If any three values are
- known, the other three can be calculated. The exception to this is that
- having all three angles cannot yield the length of the sides. This isn't my
- exception, it is well documented.
-
- To arrive at what qualifier string to use, first figure out what values are
- already known. If you have two sides and an angle, picture where on the
- triangle they would rest. Then, start with the most counterclockwise item
- and call them out going clockwise. This sounds a little vague, so lets do a
- few examples.
-
-
- If you have side b, side c, and angle B, the qualifier would be SSA
- If you have side a, angle C, and side b, the qualifier would be SAS
- If you have side a, side b, and side c, the qualifier would be SSS
- If you have angle B, side a, and angle C, the qualifier would be ASA
-
-
- A
- /\
- / \
- b / \ c
- / \
- /________\
- C a B
-
- Once you do a few of them, they become a lot more natural. You just have to
- be careful not to skip around the triangle. For instance, if you have angle
- A, side a, and angle C it would NOT be ASA! The qualifier would be SAA for
- side a, angle C, and angle A. Lets use this example to demonstrate how to
- check a qualifier. The incorrect ASA is a good test case. First angle A is
- called. Then side a, but wait. To get to side a we had to skip side c and
- angle B! The qualifier will never skip two items!
-
- The remaining parameters are simply the values that correspond to the
- qualifier letters in the first parameter. If you had a qualifier of SAS, the
- three parameters that followed would be a side, angle, and side respectively.
- These numbers should be very simple to figure out once you have the qualifier
- mastered. If your head needs a little reminder, just type TrigMaster without
- any parameters and a usage screen will be displayed.
-
- This program starts a new class of freely distributable software. I call it
- EducationWare. If this software helps anyone achieve a better grade in
- Trigonometry than they ordinarily would have expected, they need to
- contribute some form of educational assistance to someone who needs it. This
- can be anything from a monetary donation to the school of your choice, to
- helping a student with their studies, to writing a program of your own on a
- different subject and releasing it under similar guidelines. If enough
- people jump on the bandwagon, maybe the average graduates of tomorrow will be
- able to read a simple job application.
-
-
- I can be contacted by mail at: 2116 S Majestic Dr
- E Wenatchee, WA 98802
-
- Or at my GEnie mail address: D.LESTER2