I would set D = 816000 and then solve
6 - 6, 12, 18, 24, 30, 36, 42, 48 54, 60, 66, 72, 78, 84, 90, 96
Given:
The rug is in the shape of a kite.
in
in
To find:
The width and area of the rug
Solution:
Width of the rug = 9 in
Area of the kite = 

= 139.5 in³
The area of the rug is 139.5 in³.