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OpenStudy (anonymous):
The side of one polygon is 20ft. Find the corresponding side of a similar polygon with corresponding sides 3 ft and 9 ft
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Directrix (directrix):
If two polygons are similar, then by definition the ratio of corresponding sides of the two polygons is a constant known as the scale factor. So, 20 is to x as 3 is to 9 where x is the length of the side that corresponds to a side of 9. 20/x = 3/9 --> Cross multiply and solve for x. @Football12
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