Geometry app

[Dave Britten]

(09-22-2019 11:27 PM)ijabbott Wrote:  I'm not sure which calculator has the best geometry app. Possibly the Casio fx-CP400 or fx-CG500 because of its relatively large screen?

I particularly like the geometry app on the Prizm (and also the fx-9860G series, which is basically the same app but with a lower-resolution monochrome screen). It's constraint based, meaning you can specify properties and relationships that must be satisfied. So for example, you could define a line segment, and constrain one endpoint's coordinates to (0,0), and constrain the length to 2. Then define another line segment with one endpoint at (0,0), and constrain the angle between the two segments to 30 degrees. Then if you drag the outer endpoint of either line segment, the other segment will rotate with it to maintain the 30-degree angle.