Parent Letter

Math 7 Unit 5 Staying in Shape

Dear Parents,

Below is information regarding Unit 5, Staying in Shape. Look for future newsletters.

Staying in Shape:

Students will be able to:

• Create similar shapes by enlarging or reducing a geometric figure in the coordinate plane.
• Describe similarities by listing corresponding parts.
• Find missing side lengths or areas in similar figures.

Vocabulary

Dilation: A type of transformation where a figure’s size is increased or decreased.

Ratio: The relationship of two quantities a and b that are measured in the same unit.

Proportion: An equation that equates two ratios.

Scale Factor: The ratio of the lengths of two corresponding sides of two similar polygons.

Similar Figures: Two figures such that their corresponding angles are congruent and their corresponding sides are proportional. The symbol for “is similar to” is .

Congruent Figures: Two figures that have exactly the same size and shape. All pairs of corresponding angles and corresponding sides are congruent. The symbol for “is congruent to” is .

Try www.intermath-uga.gatech.edu

www.regentsprep.org/regents/math/geometry/GT3/Ldilate2.htm

http://regentsprep.org/Regents/Math/sim-figs/Lsimilarf.htm

http://mathforum.org/library/drmath/view/62225.html