Proportions
These two proportion applets were created by Duane Habecker
Exploring 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.
- Similar 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.
Download the ggb file.
Two applets by Roger Moss: Visualising direct and inverse proportion: change the enlargement factor and see how x and y vary.
- Direct proportion: Move the sliders and see the coordinates change.
- Indirect proportion: See how the area of a rectangle under any point stays constant.
