As much as possible Extreme value tasks in geometry Andreas Ulovec Faculty of Mathematics University of Vienna.

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Presentation transcript:

As much as possible Extreme value tasks in geometry Andreas Ulovec Faculty of Mathematics University of Vienna

A typical task … We have a rectangular triangle with a = 3 cm, b = 4 cm, c = 5 cm, and we want to inscribe the largest (area) rectangle when one side of it lays on c.

… with a typical answer? First guess of most students: A square ???

How to find out the answer? Calculus (Analysis): Area = e·f, and then … Let‘s stop here for a moment, because most students stop to think here, too …

Finding out an approximate answer with GeoGebra Make the construction in GeoGebra Calculate Area = e·f We (again) want to find out for which value of f we have the maximum value of Area Construct a point P with coordinates P = (f,Area) Try out different rectangles Use button “trace” (stopa zapnutá) to draw the graph

Is “a square” correct? Apparently not!

So what is the answer? f ≈ 1.2 cm, e ≈ 2.5 cm

And now, if you insist … … you can ask “why the analytic solution might be interesting?” GeoGebra gives you only an approximation, and you might want to know the exact solution This is no proof! (some might disagree) It is useful to know a general analytical approach, as the GeoGebra method has limitations

More of the same … Find the maximum area … … or the maximum volume:

Conclusion Don’t hit everything on the head with calculus and derivatives right away … … but don’t forget how to use calculus! THANK YOU FOR YOUR ATTENTION! ĎAKUJEM ZA POZORNOSŤ!