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What is the difference between first and third angle drawings?
It is just where the elevation is positioned, first angle, the drawings is positioned to the right of the section and third, the elevation is positioned to the left of the section, obviously rotated the correct way too.
How do you interpret first and third angle projection?
The front elevation is in the centre in both projections. In 1st angle projection the end elevation is on the opposite side of the front elevation and the plan view is below the front elevation. In 3rd angle projection the plan view is above the front elevation and the end elevations are on the same side as viewed
What angle is corresponding angle to another angle?
A second angle measuring 90 degrees minus the first angle.
What is the difference between first and third angle drawings and imperial and metric systems of measurements?
In first angle drawings, the front view is on the lower left, with the side view to its right and plan view above it. On a third angle drawing, the front view is to the lower right, with the side view to the left and plan view above it. The metric system of measurement is based on a base 10 plan, with each unit having specific multiples that are powers of ten, e.g., kilo, meaning 10^3 units or milli- meaning 10^-3 units. In contrast, the imperial system uses varying lengths, such as 16 ounces in a pound or 12 inches in a foot.
Advantages of a third angle drawing?
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.
