+\section basic_properties_anchor Basic Properties
+
+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.
+
+To start one of <b>Basic Properties</b> calculations, select <b>Length</b>, <b>Area</b>
+or <b>Volume</b> item from <b>Measurements - Basic Properties</b> menu.
+
+\image html basic_props.png
+
+In the dialog box select the required type of calculation (length, area or volume), select
+the the object (mesh, sub-mesh or group) and press \em Compute button.
+
+The result of calculation will be shown in the bottom area of the
+dialog box.
+
+\note
+- If mesh consists of 3D elements only, its "length" and "area" will be 0.
+- As calculation result is a sum of length, area and volume of all mesh elements,
+ duplications are not taken into account; i.e. all duplicated elements
+ (elements built on the same set of nodes) will be included into the result.
+- Similarly, intersection of elements is not taken into account.
+
