18x1
9x2
6x3
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thare is only 1 differint rectangles
More information is needed because it can have many dimensions such as:- 1*18 = 18 2*9 = 18 3*6 = 18
The following rectangles have a length and width that make an area of 36: 1 x 36; 2 x 18; 3 x 12; 4 x 9; 6 x 6
9
You could consider the cross as two intersecting rectangles. Calculate the area of both rectangles and the area of the intersection (overlap). Then area of cross = sum of the areas of the rectangles minus the area of the overlap.