
GSP 3.0 (was Re: Please recommend geometry software
Posted:
Mar 17, 1995 5:08 AM


EASILYINCENSEDREADERALERT: I work for Key Curriculum Press, and though I don't speak for them in this post, I shamelessly plug their products. If you find such blatant selfpromotion an unseemly use of the Internet, please stop reading this article now. Thanks, Nick.
In article <Pine.3.89.9503161947.A54450100000@belnet.bellevue.k12.wa.us>, mabbotta@belnet.bellevue.k12.wa.us (Art Mabbott) wrote:
> Recommendation #1: THE TEXT.
Absolutely; this is certainly the top priority. It's a shame that textbook development cycles are governed largely by state adoption cycles and other marketing concerns: it means that the average life of a textbook is far longer than the average life of any particular version of a computer program. This in turn makes it difficult to find a good working text/technology solution, with uptodate ingredients in both domains.
While Sketchpad was originally developed outside Key Curriculum Press, Serra's book was my model during early Sketchpad conception for how geometry >could< be taught, if not how it >should< be. Since Sketchpad's become commercially associated with Key Curriculum, the company's _Exploring Geometry_ book of Sketchpad activities has a detailed correlation of computer investigations to those found in Serra's _Discovering Geometry_ book.
> Recommendation #2. Dynamic software. Again the choice is simple. > We have Geometer's Sketchpad on our macs in a schoolwide lab. > It is great!!
Thanks! Teachers'and more importantly :), students' enthusiasm for it keeps us working hard on Sketchpad. No matter how "great" many people find, there's always lots more that can be done...as students and their teachers constantly tell me!
> GSP is supposed to be coming out with a new version (3.0) this > spring and I have no idea what bells and whistles it will > contain...
In that this seems to be public knowledge these days, and in that we've finally made our "official announcement" (in a mailing to Sketchpad 2.x customers last week), I suppose I can spill the beans here about Sketchpad 3.0:
Sketchpad 3.0 will be released at the NCTM national meeting in Boston next month. If you're there and have a chance, please come to the User's Group Meetingwhich Bill Marthinsen announced in this forum previously for a demo and more information.
For those of you who are upgradehappy, the general terms are the same as in our previous upgrade: if you have a sitelicense, Key Curriculum will send you the new version for free next month. If you have a single user version or a tenpack, you should be receiving a mailing soon, or have already received it, that offers an inexpensive upgrade (I think it's under $30) and a discount on a sitelicense. For new users, the price is the same as previous versions. You'll have to call Key Curriculum for specifics.
Sketchpad 3.0 is the largest single upgrade to the program yet. It reflects both our findings in four years of (NSFsponsored) research into how the original Sketchpad was being used in classes across the country (and more recently: the world), as well as the shifting nature of geometry in today's math classroom. As the role of the new Standards have begun to shift from that of elegant rhetoric to an actual foundation for classroom action, so too has the purpose and nature of geometry and geometry education. In addition to being one of the traditional math disciplines most readily adapted to some form of "laboratory" practice, geometry is one of the most versatile in its connections to other mathematical subjects, to the sciences, and to general logic, analysis, and reasoning. Sketchpad 3.0 attempts to deliver on all of these fronts.
Here's a preview of what you can expect:
(Because I'm writing this, instead of Key's marketing department, I get to present its features in the order >I< think they're relevant.)
 Improvements in the program's ease of use. This encompasses a variety of enhancements, from simplified commands to continuous visual, textual, and tactile interface feedback (no more questions: "how close is 'close enough?'"), to the ability to configure the program's geometry menus to a level appropriate to your students, to specific functionality aimed at special populations (a keyboard interface for people who aren't agile with the mouse; "large text" option for the visionimpaired and for presenters using inadequately lit projection devices), and so on. However, since you're reading geometry.software.dynamic, I assume you already find programs like Sketchpad relatively easy to use, so I won't dwell on these improvements more than this.  Script Tools. These allow you to turn Sketchpad scripts geometric constructions which you've recordedinto fullblown interactive drawing tools. Are your students interested in the applications of geometry to architecture? If so, they can augment the standard Compass and Straightedge tools with tools to draw Ogee arches, to calculate buildingfacades in the Golden Ratio, to add fleurdelys and quatrefoil ornamentation...tools which they've authored themselves, using Euclid's tools to define Le Corbusier's, and then Le Corbusier's to define their own. Are you instead interested in introducing them to the Poincare disk? Then turn off the Construct, Transform, and Measure menu, and give them a custombuilt microworld based on script tools which draw hyperbolic lines, segments, bisectors, etc. Script tools extend the geometric vocabulary of the program indefinitely, by allowing you, your students, or other Sketchpad curricula developers to define new easytouse primitives and add them to the program transparently.  Analytic geometry. In addition to being able to create coordinate systems, grids, and axes, and measure coordinates and equations of objects with the coordinate system, Sketchpad 3.0 lets you plot measurements and calculationsfrom whatever sourcedirectly onto your coordinate system. Because Sketchpad's dynamic, every calculation is an equation, which you means you can not only move from geometry to algebra, but from algebraor trig, calculus, physics, personal finance, what have youback to geometry. The program inherently supports both rectangular and polar coordinate systems. But by allowing you to plotand dynamically varyany calculation or measurement, you can readily model other coordinate systems: complex, conjugate, etc. In addition, coupled with the program's ability to construct loci, the ability to plot calculations allows you to define new objects analytically: conics, quartics, Bezier and Bsplines...if you can come up with an analytic definition, Sketchpad can create it. (You can use regular geometric measurements, coordinate values, and the co efficients and parameters of measured equations as terms in your calculations.)  Mathematical notation. In the days when computer displays were limited to text characters, and when processors ran as quickly as the last drops of ketchup from its bottle, symbolic notation like "sqrt((dx^2)+((dy^2))" was, if not acceptable, a necessary inconvenience. Since that time, such notation has been foisted on the math classroom by the calculator industry largely without good reason. Sketchpad 3.0's notationfor measurements, calculations, geometry and algebrais the same you'll find in your textbooks.  And other stuff. Arcs, arc segments, sectors, and loci round out the program's builtin constructions; greater control over labeling lets you easily recreate existing diagrams or develop your own notation; animation is more powerful,transformations and fractals can be computed by any calculation, the calculator has received a facelift, etc.
We've also significantly improved the dynamic geometry engine (short version: drag anything, anytime), extended the online help, and greatly increased the program's ability to serve both as an exploration environment, for students and researchers, and as an authoring environment, for teachers and curriculum developers. I will post a demo version here on the forum shortly after the NCTM meeting. (I'd post one now, rather than all this verbiage, but it won't be ready til early April.) Again, if you're in Boston and have time, please come to the User's Group meeting; if you're in Boston and >don't< have time (I know that feeling), stop by the Key booth for a personal demonstration.
Cheers,
Nick Jackiw "The Sketchpad's Geometer"
 Nick Jackiw smoke@well.com Key Curriculum Press, Inc. njackiw@keypress.com

