To Measure the Area of the Difference Between Elements

  1. Select the Measure Area tool ( Drawing > Analyze > Measure ).


  2. In the tool settings window, set Method to Difference.

    If any elements are selected, they are de-selected.

  3. Select the element from which to subtract.
  4. Select the element to subtract from the element selected in the preceding step.
  5. Optional: Use Ctrl-data point to select further elements to subtract.
  6. Enter a data point.

    The results display in the tool settings window. When measuring a union, the Perimeter value does not display if the elements do not overlap. If Mass Properties is on, the mass properties analysis is displayed in the Mass Properties window.