An arc is defined as a curved line that describes a portion of the circumference of a circle. There are 3 ways to initiate the Arc Command (Picture below) . They are:
You can create Arc objects using several methods. These methods are embedded within the Arc Command itself in the form of Command Option, which are listed in the sub-menu when you select Draw | Arc on the menu bar. The Arc command options are :
1. 3 Points
With this method, three points define the Start point of the arc, a Second point that the arc passes through, and the arc’s Endpoint.
Example ( Picture A ) ;
Command: _arc Specify start point of arc or [Center] : pick 1 1
Specify second point of arc or [Center/End] : pick 2 2
Specify end point of arc : pick 3 3
You may use the keyboard and specify the coordinates, or you may use
the mouse to defining any of these 3 points.
2. Start Point, Center, End Point ( S, C, E )
Center refers to the Center point of the circle of which the arc is a part.
Example( Picture B ) ;
Command: _arc Specify start point of arc or [Center] : pick 1 ( start )
Specify second point of arc or
[Center/End]: _c Specify center point of arc: pick 2 ( center )
Specify end point of arc or [Angle/chord Length] : A ( end )
Specify included angle : 90
3. Start Point, Center, Included Angle ( S, C, A )
Requires specifying the Start point and the Center of the arc first, and then specifying the Included Angle.
Example( Picture C ) ;
Command: _arc Specify start point of arc or [Center] : pick 1 ( start )
Specify second point of arc or
[Center/End]: _c Specify center point of arc : pick 1 ( center )
Specify end point of arc or
[Angle/chord Length]: _a Specify included angle : 270 ( angle )
4. Start Point, Center, Length Of Chord ( S, C, L )
Requires specifying the Start point and the Center of the arc first, and then specifying the Length of chord.
Example ( Picture D);
Command: _arc Specify start point of arc or [Center] : pick 1 A
Specify second point of arc or
[Center/End]: _c Specify center point of arc : pick 2 B
Specify end point of arc or
[Angle/chord Length]: _l Specify length of chord: 2.5
5. Start Point, End Point, Radius ( S, E, R )
Allows specifying both the Start and the End point of the arc. The arc will automatically be calculated when you specify the included radius.
Example(Picture E);
Command: _arc Specify start point of arc or [Center] : pick 1 A
Specify second point of arc or [Center/End]: e
Specify end point of arc : pick 2 B
Specify center point of arc or
[Angle/Direction/Radius]: _r Specify radius of arc: 1
6. Start Point, End Point, Included Angle ( S, E, A )
Requires specifying the Start point and the End point of the arc first, and then specifying the included angle.
Example(Picture F) ;
Command: _arc Specify start point of arc or [Center] : pick 1 A
Specify second point of arc or [Center/End]: e
Specify end point of arc : pick 2 B
Specify center point of arc or
[Angle/Length of Chord/<Endpoint>]: Angle Included angle: 90
7. Start Point, End Point, Starting Direction ( S, E, D )
The direction is tangent to the start point. (Picture below)
8. Center, Start Point, End Point ( C, S, E )
The options include start, center, end but the are not in the same order.
(Picture below)
9. Center, Start Point, Included Angle ( C, S, A )
The options include start, center, angle. However, they are not in the same order. (Picture below)
10. Center, Start Point, Length Of Chord ( C, S, L )
This is similar to the start, center and length option but not in the same order. Length means length of chord. (Picture below)
To Be Continue.. Next > Drawing Ellipse.
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