Arectangle is dialated using a scale factor of 6. the image is then dilated using a scale factor of one thirds. what scale factor could you use to dilate the original rectangle to get the final rectangle? explain

You can use a scale factor of 2 to dilate the original and get the final. I got this answer by doing: 
y x 6 = 6y (y represents the original rectangle, 6y represents the second rectangle)

then, 6y x 1/3 = 2y (2y represents the final rectangle)

If you compare the original rectangle (y) to the final (2y), you see that the final is 2 times the original, therefore the scale factor is 2

Its equal to d=7.07in

The answer is -pie over 2