Final answer:
Isometric perspective is a three-dimensional drawing style that maintains scale uniformly in all directions without convergence at vanishing points, different from linear perspective which uses one or more vanishing points to create depth.
Step-by-step explanation:
The three-dimensional drawing style where all sides are measured to scale and depicted at an angle of 30° to the horizontal is isometric perspective. This method allows objects to be drawn in a way that the dimensions along each of the three principal axes can be measured directly, without any distortion that typically comes from foreshortening. Isometric perspective differs from linear perspective, as isometric drawings do not converge at vanishing points; instead, this perspective keeps all scales intact, which is useful for technical drawings where measurements need to be accurate.
Linear perspective, in comparison, involves a more complex approach where parallel lines appear to converge as they recede into the distance, meeting at one or more vanishing points on the horizon line. This method is essential in creating an illusion of depth on a two-dimensional surface, such as in a scale drawing or painting. Depending on the number of vanishing points used, we can differentiate between one-point, two-point, or multiple-point perspective.