https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092306#M44815 <P>The larger polygon of the three polygons.... is it a convex hull you are talking about?</P><P>An image of your situation would certainly go a long way to differentiating the contributing segments of the various perimeters for shapes.&nbsp; Even simple shapes don't yield simple solutions (consider 3 circles enclosed within a circle, and 3 triangles within a triangle</P> Wed, 25 Aug 2021 16:58:05 GMT DanPatterson 2021-08-25T16:58:05Z https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092237#M44806 <P>Hello, I have a set of polygons, in turn formed by several polygons. Let's suppose a large polygon formed by three smaller polygons. Is there any method to know the outer perimeter of the set of three polygons, and the proportion of that outer perimeter that corresponds to each of the subpolygons? Thanks in advance</P> Wed, 25 Aug 2021 14:59:20 GMT https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092237#M44806 sunpit 2021-08-25T14:59:20Z https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092248#M44807 <P>You have the three original polygons, correct?&nbsp; You can take the perimeter (length) value of each, and divide them by the perimeter of the large single polygon.&nbsp; That's the ratio / proportion.&nbsp; Multiply by 100 to get actual percentage.</P> Wed, 25 Aug 2021 15:14:47 GMT https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092248#M44807 JoeBorgione 2021-08-25T15:14:47Z https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092306#M44815 <P>The larger polygon of the three polygons.... is it a convex hull you are talking about?</P><P>An image of your situation would certainly go a long way to differentiating the contributing segments of the various perimeters for shapes.&nbsp; Even simple shapes don't yield simple solutions (consider 3 circles enclosed within a circle, and 3 triangles within a triangle</P> Wed, 25 Aug 2021 16:58:05 GMT https://community.esri.com/t5/arcgis-pro-questions/perimeter-in-polygon/m-p/1092306#M44815 DanPatterson 2021-08-25T16:58:05Z