Pythagorean theorem is awesome when you're working with right triangles, but pre-calculus doesn't just limit the triangles to right triangles. So this program excepts any 3 parts of a triangle. Be it 3 sides, 2 sides and an angle, or 2 angles and a side. The order you enter them in doesn't matter. In fact, the program is geared to allow you to input the known values as easily as possible. Once entered, the program will find the missing pieces. If the triangle has two solutions, it'll provide both solutions as well. The program also calculates the perimeter (sorry, didn't have time to add area to the program). The input is not validated. Entering 3 of the same pieces or 3 angles will cause the program to choke. After the result has been displayed, press Home to exit or press Enter to solve another triangle.

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Continue reading “TriSolve – Finding the missing triangle pieces”

Find the area under a curve or graph. Enter an equation, the lower bound, upper bound, and the number of iterations or "boxes." SumArea then shows its work. It provides delta x (or the width of the boxes), the calculations for right end points, left end points, and middle points. SumArea pauses often to allow review of the data (press Enter to continue or ON to exit). After hitting pause a few times, look for the line with "= [number]" – this line is the sum (aka: the answer) for the calculation in progress.

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You'll need to use a TI font (such as TI-92 Mini Sans) to view on your PC. But in theory, may transfer over without problems on to other TIs (such as TI-85,83,82,etc). Just copy the text (with all the goofy characters) over to the TI GraphLink Program Editor and save it as a program (it won't run so you'll need to go to Program Edit on your calculator)

Pre-Calc Trig Formulas (TI-89 text file)

PC text version

 

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Here's another one of my favorite apps. Its gotten a lot of mileage and originally started out on a TI-81. It asks for X1, Y1, X2, Y2 which is typically in a text book as (X1, Y1), (X2, Y2). Plop the 2 coordinates in and it tells you the slope (M), distance between the two points, and the X and Y intercepts (if available).

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Give it A, B, and C and it spews out all sorts of nifty info regarding the equation. This app was originally done on a TI-81 and perfected over time. If its a valid equation producing two real numbers, then it will let you know if its a parabola and if it opens up or down as well as the exact points it crosses the X axis and the vertex point.

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Continue reading “Quadratic Equation Solver”