Stretching and Shrinking: Understanding Similarity (Connected Mathematics 2)

Glenda Lappan, James T. Fey, William M. Fitzgerald , Susan N. Friel, Elizabeth Philips, "Stretching and Shrinking: Understanding Similarity (Connected Mathematics 2)"
Pearson/Prentice Hall | 2006 | ISBN: 0131656694 | 107 pages | PDF | 8,2 MB

The next unit in your child’s mathematics class this year is Stretching and
Shrinking: Similarity. Its focus is geometry, and it develops understanding of and
skill in the use of concepts of similarity.
UNIT GOALS
In this unit, your child will use properties of similar figures to explore reductions
and enlargements such as those made on copy machines. Similarity will also be
used to estimate the height of real objects (such as buildings and flagpoles) and
the distance across large areas (such as ponds).
The problems are designed to help students begin to reason proportionally by
scaling in geometry situations. By the end of this unit, your child will know how
to create similar figures, how to determine whether two figures are similar, and
how to predict the relationship between lengths and areas for two similar
figures. The next unit, Comparing and Scaling, continues to develop proportional
ideas in numerical, rather than geometric, contexts.

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