When using the Geometer's Sketchpad it is often better to "start from sketch, not from scratch". That is, give students a premade sketch rather having them build something from nothing (as many textbooks would have you do). In this activity, students investigate angle relationships in parallel lines cut by a transversal. The sketch has some dynamic investigation as well as embedded quizzes and ends with the definition of the theorems. So this sketch fits very well with the fact that the expectation for grade 8 is via investigation.

Gr8NS - determine, through investigation using a variety of tools (e.g., dynamic geometry software, concrete materials, protractor) and strategies (e.g., paper folding), the angle relationships for intersecting lines and for parallel lines and transversals, and the sum of the angles of a triangle;

MFM1P - determine, through investigation using a variety of tools (e.g., dynamic geometry software, concrete materials), and describe the properties and relationships of the angles formed by parallel lines cut by a transversal, and apply the results to problems involving parallel lines

MPM1D - As review

All that is needed is the electronic download (below)

Note that this really works well on an iPad using the Sketchpad Explorer App (which is free)

You can also use this on any web based computer (or Chromebook) with this Web sketch

Watch the video below to see how to use the sketch.

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