Activities such as these can
help students learn about geometric relationships among similar
objects, as described in the Geometry Standard.
The following links to an updated version of the eexample.

Investigating
Connections between Measurements and Scale Factors of Similar Figures (6.3) Using this twopart eexample helps students find the
relationships that exist within the ratio of perimeter and area (or surface
area and volume) of two similar figures. Options for variability include
changing the scale factor and type of figure.

The eexample below contains the original applet which conforms more closely to the pointers in the book.
This
twopart example illustrates how students can learn about the length,
perimeter, area, and volume of similar objects using dynamic figures.

Side Length and Area of Similar Figures (6.3.1)
The user can manipulate the side lengths of one of two similar rectangles and the scale factor to learn about how the side lengths, perimeters, and areas of the two rectangles are related. 

Side Length, Volume, and Surface Area of Similar Solids (6.3.2)
The user
can manipulate the scale factor that links two threedimensional
rectangular prisms and learn about the relationships among edge
lengths, surface areas, and volumes. 