GSP alumni include thousands of math teachers who say: “I didn’t really understand the centroid until I built one in Sketchpad and dragged it.” You can still run GSP today. Open it, draw a triangle, select the three midpoints, construct the medial triangle, then drag a vertex .
Jackiw, a programmer and mathematician, imagined something radical: . What if a triangle kept its properties even as you pulled a vertex? What if students could see the invariant relationships — angles summing to 180°, the circumcenter moving — in real time?
This is a complete historical and functional story of — from its visionary origins to its lasting legacy in education and mathematics. Part 1: The Spark — A Vision for Dynamic Geometry (1980s) In the mid-1980s, a doctoral student named Nicholas Jackiw at the University of California, Berkeley, was frustrated. He saw how geometry was taught: static diagrams on chalkboards, rigid compass-and-straightedge constructions on paper. Students memorized theorems but rarely explored .
The lines move. The ratios stay fixed. The conjecture proves itself.
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