Posted by **Melanie** on Saturday, February 4, 2012 at 7:28pm.

How do you find the perimeter of a second polygon given just the scale factor of both polygons and the perimeter of the larger polygon?

The problem is

Two similar polygons have a scale factor of 3:5. The perimeter of the large polygon is 120 feet. Find the perimeter of the small polygon.

do not just tell me the answer, but please tell me how you got it as well. Thank you :)

- geometry -
**MathMate**, Saturday, February 4, 2012 at 8:15pm
Assume the scale factor is s where s<1 since the second polygon is smaller.

If the scale factor s>1, that means the reciprocal should be use.

Let P=perimeter of the larger polygon, then the perimeter of the smaller polygon is

p=P*s

- geometry -
**Melanie**, Saturday, February 4, 2012 at 8:49pm
Did you get 200 for this particular problem? cause that's what I got, which doesn't make sense to me because it's suppose to be less than 120 since it's the smaller polygon

- geometry -
**Dezaray **, Tuesday, March 24, 2015 at 4:08pm
Polygon R and polygon S are similar. The perimeter of polygon R is 192 cm, and the perimeter of polygon S is 36 cm. If one side of polygon S is 3 cm, what is the length of the corresponding side in polygon R?

## Answer This Question

## Related Questions

- geometry - the scale factor of two similar polygons as 4:7. the perimeter of the...
- math - if two polygons are similar,how can you find the scale factor from one ...
- math - The scale factor of 2 similar polygons is 3:4. If the perimeter of the ...
- geometry - Assume there are 2 similar polygons, whose scale factor is 4:5. If ...
- Algebra 1 - The perimeter of the rectangle shown below is 16a+2b. Which ...
- geometry - The shortest side of two polygons have lenghts in the ratio 2:5.The ...
- Geometry - The area of the larger of two similar polygons is 315 squared ...
- geometry - The area of the larger of two similar polygons is 729 square ...
- math HELP SOS - If two polygons are similar,how can you find the scale factor ...
- MATH - Two polygons are congruent and the perimeter of the first polygon is 38 ...

More Related Questions