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-
-
- !TRIANGLES
- ===================
- Supporting interactive help
- and
- movable error and message windows
-
-
-
- 1. Intro
- 2. Default Window
- 3. Trig Windows - Sine,Cos and Tan
- 4. Formulae
- 5. Graph
- 6. Disclaimer
- 7. Known Bugs
- 8. Licence
-
-
- 1 : Intro
-
- !Triangles will find the angles, internal area and the lengths of sides
- for any right angle triangle and allows the calculation of angles,
- with full working displayed, using Sine, Cosine and Tangent.
-
- When installed, clicking on the icon bar will display the default
- calculations window. Clicking Menu here or over the icon bar icon
- allows three more windows to be opened; Sine, Cosine and Tangent.
-
- Windows remain open contemporaneously to allow comparison between
- different calculations and diagrams.
-
- Selecting Quit from the icon bar icon closes all windows and removes
- !Triangles.
-
- Should you make an error with your input, or in the very unlikely
- event of an internal error from Triangles, a fully style guide
- compliant error window will appear. The error window can be moved
- around the screen so that you can view the Triangles window and find
- your error. I find that 'normal' error windows always open over the
- part of the screen containing the error, thus preventing you from
- examining it!
-
-
- 2 : Default Window (F4)
-
- The default window is for calculating as many angles and sides of the
- triangle as possible. It cannot perform miracles so in reality you must
- enter a minimum of one angle and a side, or the lengths of two sides
- before much can happen.
-
- If more than the minimum details are entered, the validity of the data
- is checked. If three sides are entered, it will ensure that a right
- angle triangle can exist with the given dimensions, and that the
- hypotenuse is the longer side!
- NB: Your triangle may be rejected if you enter 'rounded' values since
- the checking routine assumes a very high degree of accuracy.
-
- Values for lengths take precedence over angles, so three valid sides
- and an impossible angle will result in the valid sides being used to
- re-calculate the angles.
-
- Angles equal to or greater than 90° are not allowed, nor are angles
- of 0° or less.
-
- If only angles are provided it is impossible to determine the length
- of the sides or the area of the triangle. The relevant boxes will
- display N/A to indicate that the variables are not applicable to the
- solution.
-
-
-
- 3 : Trig Windows Sine (F1), Cosine (F2), Tangent (F3)
-
-
- These windows allow calculations to be made with the appropriate
- trigonometrical function.
-
- Enter the lengths of the appropriate two sides of the triangle, then
- click on Calculate. The answer and working out is shown on screen. The
- calculations are displayed at each stage of the process so that the
- method can be followed.
-
- A scale drawing of the triangle is shown to the right of the calculations
- box. The Reset button clears the display.
-
-
- 4 : Formulae (F5)
-
-
- Brief reminders of the formulae commonly used with right angle triangles.
- There is no user input in the Formulae window.
-
-
- 5 : Graph (F6)
-
-
- This window allows the user to plot either a sine curve, cosine curve,
- or both curves, with a choice of degree or radian graduations along
- each axis.
-
- By moving the pointer over the graph area the normal pointer changes to a
- cross hair. This can be positioned anywhere on the graph and the current
- values for x, sine x and cosine x can be read from a display box to the
- left of the graph.
-
-
- 6 : Disclaimer
-
-
- This application is supplied 'as is'. No warranty is made, nor will
- any responsibility be accepted for any loss, damage or other problems
- whatsoever arising from use of the software.
-
- The application is NOT guaranteed to be 100% bug free although it has
- worked without problems whilst being tested on an A5000 and an A4000
- using Risc OS 3.1 and 3.11
-
-
- 7 : Known Bugs
-
- Only one, and it's not really a bug. If you enter values for two
- sides which result in the third side having a length which includes
- very many digits after the decimal point, Triangles will round this to
- about 10 decimal places. If you then click on 'Calculate' again,
- Triangles may register an error due to the 'rounding up'. You should
- not, of course, need to click on 'Calculate' again if you haven't altered
- any values, but I suppose you might.
-
-
- 8 : Licence Conditions
-
- THIS APPLICATION IS SHAREWARE...
-
- I retain full copyright on this program but grant the user a licence as
- follows :
-
-
- a. No changes should be made to the files within the application directory
- or any of its sub directories without my consent (excluding the addition of
- foreign language message files). If you create a foreign language file
- please send me a copy and I'll include it in future versions.
-
- b. No charge may be made by third parties for the software,other than
- to cover distribution costs (ie postage and a blank disc).
-
- It may be provided FREELY on any electronic distribution system such
- as BBS and Internet sites.
-
- c. There is no registration fee for individual, non commercial users.
-
-
-
- d. If you are still using the software,IN A NON DOMESTIC ENVIRONMENT
- ( school, business etc ), after 14 days you should register with me,
- sending your address, e-mail (if you have one) and a fee of 10 Uk pounds.
- Pleased also indicate the name and version of the program you are
- registering.
- In return you will receive the latest version, an unlimited site
- licence,free support and free upgrades if and when they occur.
-
-
- If you have any comments, bugs, ideas for extensions or for other
- applications contact me as below. Use e-mail if possible please.
-
-
- D.Robinson,
- 6 St James Road,
- Torpoint,
- Cornwall.
- England
-
- email: software@zephryus.demon.co.uk
-
-
- Blatent Plug
- ~~~~~~~~~~~~
-
- For this and other Acorn programs, as well as various educational
- resources for teachers and students, try a visit to the Educational
- Resources Site at http://www.avel.com/community/edu/home.html
-
- Comments and contributions welcome :)