-This operation allows calculation of length, area or volume for the the selected
-object:
-- Length is calculated as a sum of length of all 1D elements;
-- Area id a sum of area of all 2D elements
-- Volume is a sum of volume of all 3D elements.
+This operation provides calculation of length, area or volume for the the selected object:
+- \b Length is calculated as a sum of lengths of all 1D elements;
+- \b Area is a sum of areas of all 2D elements
+- \b Volume is a sum of volumes of all 3D elements.