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If 'S' is the relationship between actual and scale linear dimensions,then 'S2' is the relationship between actual and scale areas.
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The areas are proportional to the square of the scale factor.
Find the areas of the rectangles and triangles. Add them together.
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.