Finding length, area, volume of similar figures using scale factor

In this video I have explained how you can find length, area and volume of similar figures from the scale factor and how you can find the scale factor from area of two similar figures

[romakozlovsky]

Thanks got a 100% on math test I'm 14 8th grade

[ethanmerrill]

thanks for heping me find the "wolume"

[riyakhan]

Confused about the square root part . Do we have to take the square root of scale factor every time we are finding length ?