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Gerry Stahl
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The Circumcenter of a Triangle
Activity
Gerry Stahl
Construct the Midpoint
Activity
Gerry Stahl
The Drag Test
Activity
Gerry Stahl
Translate by a Vector
Activity
Gerry Stahl
The Incenter of a Triangle
Activity
Gerry Stahl
The Construction Crew Game
Book
Gerry Stahl
test
Book
Gerry Stahl
Challenge 44: The Nine-Point Circle of a Triangle
Activity
Gerry Stahl
Challenge 43: The Euler Segment of a Triangle
Activity
Gerry Stahl
Challenge 49: Dependencies in the World
Activity
Gerry Stahl
Challenge 38: Build a Hierarchy of Quadrilaterals
Activity
Gerry Stahl
Challenge 24: Side-Angle-Side (SAS)
Activity
Gerry Stahl
Challenge 21: Construct a Congruent Angle
Activity
Gerry Stahl
Challenge 16: Copy a Length
Activity
Gerry Stahl
Challenge 15: An Isosceles-Right Triangle
Activity
Gerry Stahl
Challenge 09: Construct the Midpoint
Activity
Gerry Stahl
Challenge 07: Construct an Equilateral Triangle
Activity
Gerry Stahl
Challenge 06: Construct Polygons in Different Ways
Activity
Gerry Stahl
Challenge 05: Play with Hidden Objects
Activity
Gerry Stahl
Challenge 04: Play by Dragging Connections
Activity
Gerry Stahl
Challenge 40: The Circumcenter of a Triangle
Activity
Gerry Stahl
Challenge 41: The Orthocenter of a Triangle
Activity
Gerry Stahl
Challenge 42: The Incenter of a Triangle
Activity
Gerry Stahl
Challenge 48: How Many Ways Can You Invent?
Activity
Gerry Stahl
