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That's what an isometric drawing is: the third dimension is shown at a 30 degree angle to the horizontal.
The number 30 isn't magic - any other number in that 'ballpark' would work - but it's an easy number ( a third of a right angle, and it's clearly different from 60 degrees, which is why 45 degrees wouldn't be great), and the resulting drawing makes the 3-D object easy to visualize.
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Earn +20 ptsQ: Why isometric drawing is started with 30 degree angle to horizontal line?
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