CK-12 Geometry-Concepts

7.3. Similar Polygons and Scale Factors http://www.ck12.org

7.3 Similar Polygons and Scale Factors

Here you’ll learn how to identify similar polygons and how to use scale factors to solve for missing sides of similar
polygons.

What if you were comparing a baseball diamond and a softball diamond? A baseball diamond is a square with 90
foot sides. A softball diamond is a square with 60 foot sides. Are the two diamonds similar? If so, what is the scale
factor? After completing this Concept, you’ll be able to use your knowledge of similar polygons to answer these
questions.

Watch This

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/52542

CK-12 Foundation: Chapter7SimilarPolygonsandScaleFactorsA

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/1346

James Sousa: Similar Polygons

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/1347

James Sousa: Scale Factor

Guidance

Similar polygonsare two polygons with the same shape, but not necessarily the same size. Similar polygons have
corresponding angles that arecongruent,and corresponding sides that areproportional.