*On 12.03.17, In Computers, by ivaylo2009*

Autocad Tips.

You can obtain the area, perimeter, and mass properties defined by selected objects or a sequence of points.

You can calculate and display the area and perimeter of a sequence of points. You can also obtain the area, perimeter, and mass properties of any of several types of objects.

**Advice:**Fast way to calculate an area bounded by several objects in 2D is to use the “BOUNDARY” command. With this command, you can pick a point within the area to create a closed polyline or region. You can then use the Properties palette or the “LIST” command to find the area and perimeter of the polyline or region.

**AREA Command**

With the “AREA” command, you can specify a series of points or select an object. If you need to calculate the combined area of more than one object, you can keep a running total as you add or subtract one area at a time from the selection set. You cannot use window selection or crossing selection to select objects.

Total area or perimeter are saved in the “AREA” and “PERIMETER” system variables.

**1.How To Calculate a Defined Area**

You can measure an arbitrary closed region defined by the points you specify. The points must lie on a plane parallel to the XY plane of the current UCS.

**2.How To Calculate Combined Areas**

You can measure more than one area, either by specifying points or by selecting objects. For example, you can measure the total area of selected rooms in a floor plan.

**3.Subtract Areas from Combined Areas**

You can subtract one or more areas from a combined area that you have already calculated. In the example, the area of the floor plan is first calculated, and then a room is subtracted.

In the following example, the closed polyline represents a metal plate with two large holes. You first calculate the area of the polyline and then subtract each hole. Area and perimeter or circumference of each object are displayed, with a running total after each step. Here is the command prompt sequence:

**Command: Area**

Specify first corner point or [Object/Add/Subtract]: a

Specify first corner point or [Object/Subtract]: o

(ADD mode) Select objects: Select the polyline (1)

Area = 0.34, Perimeter = 2.71

Total area = 0.34

(ADD mode) Select objects: Press ENTER

Specify first corner point or [Object/Subtract]: s

Specify first corner point or [Object/Add]: o

(SUBTRACT mode) Select objects: Select the lower circle (2)

Area = 0.02, Circumference = 0.46

Total area = 0.32

(SUBTRACT mode) Select objects: Select the upper circle (3)

Area = 0.02, Circumference = 0.46

Total area = 0.30

(SUBTRACT mode) Select circle or polyline: Press ENTER

Specify first corner point or [Object/Add]: Press ENTER

**4.How To Calculate Mass Properties**

With the “MASSPROP” command, you can analyze 3D solids and 2D regions for their mass properties including volume, area, moments of inertia, center of gravity, and so on. In addition, the result of the computations can be saved to a text file.

As you see the work with this operation is very easy and fast task.It can safe a lot of your time and effort to find needed properties.

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12.03.17great tips