Geometer's Sketchpad - Practice Midpoint of a Line Segment

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 can download a GSP sketch that allows them to practice determining the midpoint of a line segment on the first page (this part could also be used to check answers) and then to be quizzed with randomly generated sets of points on the second page.

MPM2D: B2.1 - develop the formula for the midpoint of a line segment, and use this formula to solve problems

All that is needed are the electronic downloads (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. The first page can be used for discovery or for checking problems and the second page can be used for quizzing students as it will generate an infinite number of random segments to find the midpoint of.

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