| Activity |
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Description |
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Grades |
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Topics |
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Software |
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Area: Triangles |
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In the diagram below, the blue line is parallel to the base of the triangle. When you slide B back and forth along the blue line, how do the base (AC), height (BD), and area change? |
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6 |
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Geometry |
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GSP |
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 |
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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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Far Fetched Areas Glitch Problem |
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In order to find out the area we need to make a drawing of our tiles and then use a program called the Geometer’s Sketchpad to tell us how many square centimeters there are in our tiles. |
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6, 7 |
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Geometry |
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GSP Applet |
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 |
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Get to Know Sketchpad – Triangles |
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Using Sketchpad students make a chart of examples of triangles that can be described both by their angles and sides. Are there any that are impossible? |
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6 |
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Geometry |
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GSP |
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 |
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Getting to Know Sketchpad - Triangles & Spinwheels |
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See description of Spinwheels I and II. |
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6 |
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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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 |
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How High? |
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In this activity you will learn something about how to determine the volume (how much liquid) there is in the rectangular Tank. |
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7 |
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Geometry |
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Applet |
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 |
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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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 |
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Job Offer |
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YOU GOT THE JOB! You have a choice of 2 payment plans. Study carefully both plans before deciding. |
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7 |
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Algebra, Geometry |
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SS |
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 |
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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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 |
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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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 |
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Pattern Blocks for Sale |
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How much should we charge for the design if the square costs $1.00? |
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6, 7 |
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Geometry |
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GSP |
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 |
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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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 |
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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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 |
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Rectangle: Area & Perimeter |
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Question: What is the largest the area of a rectangle be if its perimeter is 20? |
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6 |
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Geometry |
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Applet |
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Spinwheels 1 |
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Step-by-step instructions for you and your students to create an animated pinwheel with Geometer's Sketchpad. |
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6 |
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Geometry |
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GSP |
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 |
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Spinwheels II |
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Version 3 of spinwheel with hole. |
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6, 7 |
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Geometry |
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GSP |
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 |
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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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 |
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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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 |
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Tri or Not to Tri |
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2 GSP downloads |
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6 |
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Geometry |
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GSP,
GSP |
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 |
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Types of Triangles |
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This activity deals with scalene, isosceles, equilateral, and right triangles. Students use a GSP sketch or an interactive web page to drag and manipulate four triangles, one of each type, and use the activity handout(s) to guide their exploration. |
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6 |
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Geometry |
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Applet |
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