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thrid angle projection is officially used in Australia, for a fact, not lying!!

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Q: Where has third angle projection been used?
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Why second and third angle projections not used in orthographic projections?

because 2nd and 4th angle projection overlap each other

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.

What is the angle used in isometric projection?

always 30 degrees

Why can not we use second angle projection method in Engineering drawing?

In 1st angle projection the front view will be in the top of the xy plane and the top view will be in the bottom of the xy plane .In 3rd angle projection the top view will be in the top of the xy plane and front view will be in bottom of the xy plane. dis will give a clear view.i hope u know dis... but in 2 angle projection both the views(front and top) will be in the top of the xy plane and in 4th angle projection both the views (front and top) will be in the bottom of the xy plane... since both the views will be in one side of the xy plane, its not possible to draw... both views will merge... to get more clear view, refer any basic engineering drawing book.......

What is the definition of the first angle angle projection?

In first-angle projection, the projectors originate as if radiated from a viewer's eyeballs and shoot through the 3D object to project a 2D image onto the plane behind it. The 3D object is projected into 2D "paper" space as if you were looking at a radiograph of the object: the top view is under the front view, the right view is at the left of the front view. First-angle projection is the ISO standard and is primarily used in Europe.

Why we use sine angle in cross product while cos angle in dot product?

Because in dot product we take projection fashion and that is why we used cos and similar in cross product we used sin

Which projection is used by nearly all seagoing navigators?

the Mercator projection

The projection note for any map sheet identifies the projection system used on the map sheet?

True. The projection note for any map sheet identifies the projection system used on the map sheet.

Map projection is used for sea travel?

A map projection that is used for sea travel includes the gnomonic projection. This was most often used to find the shortest routes between points on a sphere.

Is a isometric projection used for developing a multiview drawing?

No, a multiview projection is used for developing a multiview drawing. Multiview projections are orthographic projection where the object is behind the plane of projection, and is oriented such that only two of its dimensions are shown.

What type of basic drawing conventions are used and why there is need to be different types of drawings?

There are basically three types of drawing conventions as: Orthographic Projection - A means of producing an accurate working drawing of a 3-dimensional object using (usually) three separate 2-dimensional views (elevations) from three different viewpoints. The most commonly used variation of Orthographic Projection are known as Third Angle and First Angle. Isometric Projection - A means of producing an accurate drawing of a 3- dimensional object using a combination of 30º lines for lines which are horizontal in real life, and vertical lines for verticals. British Standard Dimensions - An internationally recognized set of rules for applying dimensions to working drawings. Millimeters are always used.

What are projection lines?

Projection lines are used to establish relationships of part featurues between rotated veiws of the same drawing.