If a rectangle has a side length of 9 in and a perimeter of 30 in, and another, similar rectangle has a side length of 6 in, what is the perimeter of the second rectangle?
The missing side length of the first rectangle is 6 inches, because 30-(9+9)=12, and 12/2=6. (9+9+6+6=30) Now, 6 is equivalent to 2/3 of 9. Therefore, we can assume that the same baic principle applies to the second rectangle, based upon the information provided by the question.
So, if the side length of one side of the rectangle is 6, we must assume that the length of the other side is 6* 2/3, or 4. 6+6+4+4=20, so we can assume that 20 is the length of the rectangle.
