A scale diagram is useful because it alows you to draw very big things in a small sheet of paper, or a blueprint of a house in a sheet of paper unde three feet, no the problem with them is that the scaling, specially if you have to draw a whole block in a letter size sheet of paper makes you lose precision (for example) the width of the line of a pencil could be too wide and cause errors.
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Your question is a little ambiguous, but Euler Circles, sometimes called Euler diagrams, are generally regarded as far superior to Venn diagrams from a cognitive perspective since they exploit topologocal properties that match semantic properties. This exploitation means that they are well-matched to what they represent. In general, Euler diagrams do not restrict to the use of circles and are formed of arbitrary simple closed curves, like Venn diagrams. It terms of expressiveness, if one allows only the use of simple closed curves, then Euler diagrams are less expressive than Venn diagrams. However, frequently Euler diagrams are permitted to use shading (which Venn used in his diagrams to assert the emptiness of a set). Under these conditions (i.e. simple closed curves plus shading) Euler diagrams are equivalent in expressive power to Venn diagrams. Moreover, if you don't like the idea of using shading, you can remove the constraint that the closed curves must be simple and, again, this results in Euler diagrams being as expressive as Venn diagrams. I hope that helps.
The word scale has one syllable.
Venn diagrams are just one of many ways to carry out prime factorisation. Any one of the methods can be used so you can either use Venn diagrams every time, never, or when you like: your choice!
The leading tone in a scale is the 7th scale degree, one half-step below the tonic.
The scale would be 1:240