InfoArcCircleArea
Menu:
Info -> Arc/Circle/Ellipse Area
Commands: acearea, ic
Short cut: IC
This command calculates the area of arcs, circles, ellipses and
elliptical arcs, and optionally adds the information to the
current layer of a drawing. If you select any other type of entity
a warning is shown in the command line.
For arcs, there are two options for calculating areas, namely
Segment or Sector. The area of a segment (or slice) is the area
bound by the arc and and two lines drawn from the arc's startpoint
and endpoint to the arc's centre. The area of a sector is the area
bound by the arc and a chord drawn from the arc's startpoint to
the endpoint.
Figure 1: a segment (slice) and sector.
Options
This command has the standard 'Add measurement to drawing'
and 'Text Height' options.
Figure 2: Standard Info options
Whether this is off or not, when you click on an arc, circle,
ellipse or elliptical arc, the information is displayed in the
command line widget.
Figure 3: Info displayed in command line
(Note: Every time you start an info command the 'Add measurement
to drawing' checkbox is always unchecked. You must remember to
switch it on if you want the info added to the drawing).
It also adds the following options.
Figure 4: Added options
Mode:
The mode only applies to arcs.
Sector: This mode returns the area of the
sector. This is useful when used in conjunction with the 'Polygonal
Area' command.
Segment: This mode returns the area of the
segment.
Add:
Entity: This selects whether you want to add a copy of
the measured entity to the current layer of the drawing.
Chord: This selects if you want the chord(sector), or
radius lines(segment), added to the drawing.
Length: By default the area is always printed on the drawing.
This option selects whether you want extra information added to the
drawing.
For circles and full ellipses the extra information is the
circumference. This uses the centre point as the lower left corner
for the added text.
For circular arcs the extra information is the length of the arc and
the length of the chord (in sector mode), or the radius (in segment
mode).
For ellipses the extra information is the length of the arc and the
length of the chord (in sector mode), or the distance from the
centre point to the startpoint of the arc, followed by the distance
from the centre point to the endpoint of the arc (in segment mode).
The lower left corner for the added text is the endpoint of the arc.
(Note: In case you were wondering, centre is the correct UK
spelling).