In an isometric drawing, at what angles are horizontal planes typically drawn?

In isometric drawing, horizontal planes are illustrated at 30-degree angles from the horizontal baseline. This technique allows for a three-dimensional effect while maintaining clarity and proportion in the depiction of objects. The choice of a 30-degree angle is standard in isometric projection, as it creates a visual representation where the three axes (x, y, and z) are equally represented, with the angles between them being 120 degrees.

Using 30-degree angles effectively conveys depth and dimension, providing a clear and realistic understanding of the object or space being depicted. This method facilitates easier interpretation and communication of complex designs in fields such as architecture and engineering, where understanding spatial relationships is crucial.

In contrast, other angles like 45 degrees could distort the representation, and angles like 60 degrees or 90 degrees do not adhere to the established conventions of isometric drawing. Thus, the choice of 30-degree angles is essential for maintaining the integrity of isometric representations.