Usually 60 degrees.
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always 30 degrees
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.
Firstly Draw a pentagon and enclose it in a square. Then draw an isometric scale. With isometric reading draw the square first on 120degree axis, reduce the pentagon sides on isometric scale and plot it on the isometric square
William Farish
The answer is given opposite.