GEOMETER’S SKETCHPAD LESSONS
Below are examples of "investigations" in Geometer's Sketchpad prepared by students in my Methods of Teaching Secondary Mathematics class over the past few semesters. An investigation is a self-guided and self-paced worksheet that leads a student to "discover" a geometric property or theorem.
Altitudes and Orthocenters of a Triangle Angle Bisectors of a Triangle Angle Sums of Convex Polygons Angles Formed by a Transversal and Parallel Lines Area of a Parallelogram Centroid of a Triangle Chords of a Circle Exterior and Remote Interior Angles of a Triangle Exterior Angles and Opposite Interior Angles of a Triangle Exterior Angles Investigation Finding Relationships Between Area and Parallel Lines in Triangles Geometer’s Sketchpad Overview Incenters of Triangles Investigating the Sierpinski Triangle Law of Sines Midsegment Theorem Parallel Lines and Angles Parallel Lines and Transversals Pythagorean Theorem Sum of Interior Angles of Polygons Triangle Congruencies Using Sketchpad to Demonstrate the Pythagorean Theorem
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