If you have any object which needs to be rotated at an unknown angle then at that place are a couple of ways with which you tin practise it.

The most obvious way is the utilize of reference option of Rotate control.

To explicate this tip, I will apply this 2d cartoon of a spanner.

Image 1: Spanner and reference line

Using Reference option

Let'due south assume that we want to rotate the Spanner with reference to another line AB as shown in the cartoon with Red colour.

Type RO and press enter to kickoff the rotate control, select the spanner, and press enter primal again. Click on any signal on the spanner and that will get the base betoken about which the spanner will rotate.

In this instance, I am selecting a random indicate shut to the center of the spanner as the base betoken.

Now select Reference option from the command line as shown in the paradigm below.

Epitome 2: Reference option of Rotate command

Click on the 2 points in the drawing that volition act as the reference of rotation. In this case, I am selecting the midpoints of the filleted rectangle which act as the reference shown in the image below.

Paradigm 3: Reference points on the spanner

Now select Points option from the command line so click on point A and B of red line respectively. The spanner will marshal parallel to the line AB as shown in the image beneath.

Paradigm 4: Terminal alignment of spanner with respect to reference line AB

There is also an alternate way of doing this with the help of Marshal command, which I volition explain next.

Rotating with reference using ALIGN

Marshal tool is another way of rotating an object with reference to another. I will utilize the aforementioned example of spanner to explain this tip.

Type AL and press enter then select the spanner and press enter again.

Now you need to specify the beginning point of reference. Select the midpoint 1 of the filleted rectangle which we have selected earlier equally shown in the epitome iii.

Now click on indicate A on the carmine line and that will go the point on which midpoint 1 volition be placed.

Image v: Reference points for Align command

Once again select the midpoint 2 of the filleted rectangle which y'all have selected earlier and click on point B of red line as its reference.

In this case, midpoint 1 will coincide with point A, midpoint 2 will get collinear with point B and now we need to specify the third reference points.

Select any indicate directly above the spanner as the third base point and then click anywhere above line AB as the third reference bespeak.

The order of option of points in my case is shown in the paradigm below.

Rotate one object to match another unknown angle in AutoCAD

Image 6: Order of selection of points in Align command

As shortly every bit you click on the tertiary reference point the spanner will align parallel to the line AB with midpoint 1 coinciding with the point A of the red line.

Do you have questions related to this tip? Allow me know in the comments below.