The name of the technique that Velázquez used to create the illusion of depth in Las Meninas is known as the perspective technique.
Explanation:
The properties of Pythagoras' theorem and those of similar triangles of Euclid are reflected in the style of Las Meninas in terms of its geometry. The size of the canvas depends on the proportions in terms of its measurements. Velázquez used the technique of geometric perspective to embody the illusion of depth on the surface of Las Meninas.