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Tool: Side Length and Area of Similar Figures Review
Teacher Review (Based on classroom experience)
Reviewer: Jeff L, Aug 13 2005 07:43:00:233PM
Classroom use in Courses and Topics:

Math 7: Ratio and proportion, Geometry in the plane
Duration of classroom use:
One Week
What did students learn?
Middle level students seem to have a difficult time relating the linear scale factor to the area of a similar figure. This applet makes an interactive demonstration of that relationship - assuming the student has been introduced to the topics.
What did students do with the resource?
The students used the tool to compare their answers with the approximations generated by the applet.
How hard was it for students to use?
Other classroom comments:
It would have been nice to have a separate applet for each phase, i.e. scale factor side-to-side; area to area; and volume to volume. This display is a bit small for whole class demonstrations (projected on screen). See also tool 13434.
Appropriate for:
introduction to a concept, advanced investigations
What math does one need to know to use the resource?
Students need to have the basic information about similarity, congruent sides and angles, ratio and proportion as well as an idea of scale factor
What hardware expertise does one need to learn to use the resource?
What extra things must be done to make it work?
Students need to have attempted problems dealing with the scale factor and the sides of corresponding figures and scale facotr and the area of corresponding figures. Knowlege of the exponents 'squared' and 'cubed' also helps.
How hard was it for you to learn?
Very Easy
Experimentation will produce the desired result without having to read prolonged explanations.
Ability to meet my goals:
Recommended for:

Math 7: Ratio and proportion, Geometry in the plane