GeoGebra

Proportions

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These two proportion applets were created by Duane Habecker

  • Htm.gifExploring similar triangles: Move the vertices of two similar triangles and watch the lengths change. Find all the instances of equal ratios in the similar triangles.
Ggb.gifDownload
  • Htm.gifSimilar triangles with missing lengths: Two triangles are similar but two of the side lengths are missing. Move the vertices of the triangles to create a problem and then use proportions to find the missing lengths.
Ggb.gifDownload the ggb file.


Two applets by Roger Moss: Visualising direct and inverse proportion: change the enlargement factor and see how x and y vary.




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