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Description |
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Grades |
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Topics |
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Software |
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Areas and Regions |
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Good area problems for 8th Grade standardized test prep |
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8 |
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Geometry |
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GSP |
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 |
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Exterior Angles of triangle |
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Can you figure out a method to determine the measure of the exterior angle of the triangle in each sketch without using a measuring device or Sketchpad’s tools? Study your results carefully. Next determine angle BCD in the figures above without using any measuring device like a protractor. Explain (1) what you did and (2) why it works. |
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7, 8 |
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Geometry |
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GSP |
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 |
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Golden Ratio |
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The ratio, called the Golden Ratio, is the ratio of the length to the width of what is said to be one of the most aesthetically pleasing rectangular shapes |
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8 |
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Geometry |
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Investigate reflections |
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A Geometer's Sketchpad exploration activity. |
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8 |
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Geometry |
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GSP |
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Morris the Cat Expands |
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What happens to Morris when you double his coordinates? Half his coordinates? Make a prediction about how Morris will stretch or shrink if you know the stretch or shrink factor. |
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8 |
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Geometry |
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GSP |
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Name the Shapemakers |
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"Discover what other shapes these ""disguised"" squares make. " |
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8 |
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Geometry |
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GSP |
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Pick’s Rule (Theorem, Law) |
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8 |
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Geometry |
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GSP |
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Pizza Time! |
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It's lunch time and your friends are hungry. So you decide to share an extra large pizza. But after looking at the menu above, you start to think that maybe you can get more for your money if you order three medium pies instead for the same price. So what is it? One extra large pie, three medium pies, or do you think it doesn't matter because you are going to get the same amount of pizza either way? Please explain your reasoning. |
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8 |
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Geometry, Problem Solving |
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GSP |
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Tessellations: Semi regular |
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This activity asks the student to make a semi-regular tessellation. There are 8 such tessellations. Students use Sketchpad shapes above to make all the tessellations and then explain why they tessellate. |
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7, 8 |
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Geometry |
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Applet |
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The letter R Expands, Contracts and goes Negative! |
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Enlargement activity on a coordinate axis. |
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8 |
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Geometry |
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GSP |
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