I could be wrong but I do not think you can be definite. Unlike the paint tool where shift-ctrl constrains drawing to 15° increments the shear tool does not work that way. Then it depends on the view.
![[Image: 4qdAem4.jpg]](https://i.imgur.com/4qdAem4.jpg)
Cube A not possible by shear alone, it takes an initial shear (and guesswork) then a rotate. Cube B could be sheared in place but without that iso template no real way of knowing the angle. A circle is even worse.
Edit: Strictly A is isometric and B is (I think) dimetric, however it still follows the sides parallel, angle 30° principle
If you need to make iso drawings a CAD application is advisable. I use LibreCAD (occasionally), not bad and it is free.
Cube A not possible by shear alone, it takes an initial shear (and guesswork) then a rotate. Cube B could be sheared in place but without that iso template no real way of knowing the angle. A circle is even worse.
Edit: Strictly A is isometric and B is (I think) dimetric, however it still follows the sides parallel, angle 30° principle
If you need to make iso drawings a CAD application is advisable. I use LibreCAD (occasionally), not bad and it is free.