2013

Subtract Areas from Combined Areas
You can subtract more than one area from a combined area as you calculate.
For example, if you have calculated the area of a floor plan, you can subtract
the area of a room.
Example: Subtraction of Areas from a Calculation
In the following example, the closed polyline represents a metal plate with
two large holes. The area of the polyline is first calculated and then the area
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 area/Subtract area]
<Object>: a
Specify first corner point or [Object/Subtract area]: 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 area]: s
Specify first corner point or [Object/Add area]: 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 area]: Press Enter
192 | Chapter 6 Create and Modify Objects