nicolew647
nicolew647 nicolew647
  • 12-01-2018
  • Mathematics
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The ratio of the corresponding side lengths of two similar posters is 7 in:20 in. What is the ratio of the perimeters?

The ratio of the corresponding side lengths of two similar posters is 7 in20 in What is the ratio of the perimeters class=

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zhaotianyu369 zhaotianyu369
  • 18-01-2018
The ratio of their perimeters is still 7:20. The poster is a rectangle shape. If the length of each side of a poster is proportional to the other by a certain ratio, the sum of the lengths of all sides is also proportional by the same ratio. You can suppose the lengths of four sides of poster A are 7a, 7b, 7c, 7d, so poster B has 20a, 20b, 20c, 20d. (7a+7b+7c+7d)/(20a+20b+20c+20d)=7(a+b+c+d)/20(a+b+c+d)=7/20.
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