Finally, we are now in the part 3 of the arc drawing in AutoCAD. So to start with, another method of drawing an arc is:

Center, Start, End

This method is the reverse of all the previous method because the starting point is at the center and the second point is the start point. Hope my explanation is not confusing. Again to start drawing, go to menu and choose Draw>Arc>Center, Start, End. AutoCAD will prompt: _arc Specify start point of arc or [CEnter]: _c Specify center point of arc: Then pick your first point ( see Fig. 9 ) on the screen then AutoCAD will prompt again: Specify start point of arc: which means that you should pick another point on the screen using your cursor. This will be the starting point of your arc ( see Fig. 9 ) . Then after that the command prompt will say: Specify end point of arc or [Angle/chord Length]: which you can just drag your cursor clockwise or counter clockwise click your mouse to create the arc.

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This is the continuation of part 1 because this is a very long discussion and I don’t want to bore you. So the next method of drawing the arc is:

Start, End, Angle

Unlike the previous methods we have discussed so far, the arc will start on one point and the following is the end point (see Fig. 6) but the measurement of the arc will depend on the included angle. Again go back to the menu and choose Draw>Arc>Start, End, Angle. Then pick your first point on the screen then AutoCAD will prompt again: Specify end point of arc: Then after picking your end point AutoCAD will prompt again: Specify center point of arc or [Angle/Direction/Radius]: _a Specify included angle: In this sample, I used 90 degrees. Either you can type 90 on the command prompt or place your cursor on top of the first point which is 90 degrees on the polar angle. As you can see on the bottom right corner of the drawing below, the polar angle is illustrated. From the right quadrant going counter clockwise, the measurement is from zero, 90, 180, 270, 360 degrees.
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Drawing an arc is easy using AutoCAD and there are many uses of this entity like for example drawing complex shaped objects etc. etc. But first let me introduce to you what an an ARC is. Basically it is part or portion of a circle that is why the correct way of measuring an ARC is by it’s radius. Look at the drawing below (Fig 1). You can see that an arc is a portion of a circle and the center of the circle as a reference point to measure the radius, included angle and chord. The length of an ARC is determined by the measurement of the included angle between the radius and chord from the arc’s endpoints. Continue reading →