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static double areaRoot(Rect r) { ret r == null ? 0 : sqrt(area(r)); } static double areaRoot(DoubleRect r) { ret r == null ? 0 : sqrt(area(r)); } ifclass WidthAndHeight static double areaRoot(WidthAndHeight img) { ret img == null ? 0 : sqrt(area(img)); } endif static double areaRoot(BufferedImage img) { ret img == null ? 0 : sqrt(area(img)); }