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Third angle projection is in common use in the USA, Canada, and the UK. The rest of the world more commonly uses first angle. There is no inherent superiority of one projection over the other. When you are making drawings that may be used internationally, it's a very good idea to indicate by a small symbolic diagram which projection is in use. This diagram is usually a side and end view of a truncated cone.
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Why isometric drawing is started with 30 degree angle to horizontal line?
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.
What drawing has lines at 30 degrees?
A drawing of a 30 degree angle!
What is the measure of the third angle of a triangle if one angle measures 52 degrees?
The third angle is (128 degrees) minus (the second angle).
What is the angle used in oblique drawing?
30 Degrees
What is the measure of the third angle of a triangle is one angle measures 126.5 degrees and the other measures 19 degrees?
The third angle is 34.5 degrees
