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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