Geometry Expressions Newsletter
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|Geometry Expressions Newsletter||
Three of our authors are giving presentations involving Geometry Expressions at this year's NCTM annual convention in Philadelphia.
- Crop Circle Algebra: Students Teaching Farmers? Larry Ottman Friday April 27th, 11:00-12:00, rm 123
- Teaching Proofs to a Digital Generation Irina Lyublinskaya Friday April 27th, 2:00-3:00, rm 120C
- From Pedal Triangles to Savonius Wind Turbines: Students' Mathematical Modeling Projects Philip Todd Saturday April 28th, 11:00-12:00, rm 103A
Or come by our booth: Saltire Software ~ Booth 303.
|How to...generate computer code with Geometry Expressions|
You can use Geometry Expressions to create computer code in any of the following languages:
- C / Objective C
- Visual Basic (.net)
Here's a simple example.
Let's imagine you want code for the intersection point between two segments.
- First draw the segments and create a point E at their intersection.
- Next constrain the coordinates of the segments end points.
- Now select point E and Calculate / Coordinates
- If you want code which re-uses intermediate variables, then select the output and from the right click menu select Output Properties / Use Intermediate Variables / Yes
- Keeping the output selected, do Edit / Copy As / Source Code / C++
- Paste into your editor.
Here is the code generated for the above example:
double x_0 ,
double x_1 ,
double x_2 ,
double x_3 ,
double y_0 ,
double y_1 ,
double y_2 ,
double y_3 ,
double &z_0_x_ ,
double &z_0_y_ )
z_0_x_ = z_0_x;
z_0_y_ = z_0_y;
Problem of the Month
Point A has coordinates (0,1). A family of circles is defined whose centers lie on the x axis, and whose radii are a factor k times the distance between point A and their center.
Using Geometry Expressions (or otherwise), show that the envelope of this family of circles is a hyperbola if k<1 and an ellipse if k>1
Show that, in either case, A is a focus of the conic.
(See Salmon's "Higher Plane Curves", article 117)
|Electronic Book Bundle|
10 Geometry Expressions eBooks are now available as a bundle for the recession-friendly price of $79.95
- The Tortoise and Achilles
- Calculus Explorations
- The Farmer and the Mathematician
- Developing Geometry Proofs
- 101 Symbolic Geometry Examples
- 101 Conic Sections Examples
- Using Symbolic Geometry to Teach Secondary School Mathematics
- Connecting Algebra and Geometry through Technology
- Function Transformations
- Exploring with Geometry Expressions
Learning Calculus with Geometry Expressions is a unique electronic resource containing lecture-ready slides and lab-ready Geometry Expressions files.
Available for $6.99 per chapter, or $34.95 for the whole book.
See our YouTube channel
for videos exploring features in Geometry Expressions.
Phil Todd's TechIgnite talk connects central pivot irrigation in Texas to Malfatti's Problem