document.write( "Question 1160594: Kidney outer and inner shape. If I know the distance in feet around the outer irregular shape and the distance around the inner irregular shape how do I compute the square footage of the area between the 2 shapes? \n" ); document.write( "
Algebra.Com's Answer #783927 by ikleyn(52788)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "In general case --- there is NO way.\r
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\n" ); document.write( "\n" ); document.write( "To get some estimations, it requires to make some assumptions.\r
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\n" ); document.write( "\n" ); document.write( "For example, if both shapes are polygons (convex polygons), then there are analytical formulas for their areas \r
\n" ); document.write( "\n" ); document.write( "via the coordinates of their vertices.\r
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\n" ); document.write( "\n" ); document.write( "Knowing the areas for each, you may find the area in between by subtraction.\r
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\n" ); document.write( "\n" ); document.write( "In other case, if the outer shape is a narrow strip of uniform thickness around the inner shape,
\n" ); document.write( "then the area of this strip is its width multiplied by the half the sum of the perimeters of the shapes.\r
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