Math 139 Computer Lab – Geometer’s Sketchpad Lesson 30 Today we will use the program Geometer’s Sketchpad to investigate the ideas of area and perimeter. We will just be scratching the surface of what Geometer’s Sketchpad can do, but this should give you an idea of possible ways to use computers in your classrooms. To start with, we need to open the program: Start All Programs Standard Software Design Tools G e o m e t e r ’ s S k e t c h p a d Familiarize yourself with the layout of the program. Menus are along the top and tools are on the left. Use the Graph menu to select the “Show grid” option. Use the straightedge tool on the left to draw a line segment. Continue this process until you have a quadrilateral. When you have completed this, select the selection arrow tool. Highlight one side of your quadrilateral by clicking on it. From the Measure menu select “length.” You should have a box that says “mAB = some number.” In addition, your quadrilateral is now labeled
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