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of each hole is subtracted. The area and perimeter or circumference of each
object displays, with a running total after each step.
The Command prompt sequence is
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
You can also use REGION to convert the plate and the holes to regions, subtract
the holes, and then use the Properties Inspector palette or the LIST command
to find the area of the plate.
TIP Use the CAL command to convert from one system of area units to another.
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.
See also:
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Create and Combine Areas (Regions) on page 289
256 | Chapter 16 Use Precision Tools