# Why do we use 1st and 3rd angle projection?

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Both first angle and third angle projection are the two ways of drawing in orthographic that usually consists of three different views of an object in two dimensions. They are used to obtain engineering drawings for clarity.

To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.

Moreover, How do you draw a first angle projection?

Draw an orthographic projection of a H-shape. Clearly show the front, side and plan views and use guidelines to keep them level. Carefully study the symbols shown below. Normally when drawing in first or third angle projection a symbol is drawn underneath which clearly shows which angle of projection has been used.

Secondly, What is the first angle projection?

First angle projection is a method of creating a 2D drawing of a 3D object. It is mainly used in Europe and Asia and has not been officially used in Australia for many years. In Australia, third angle projection is the preferred method of orthographic projection. Note the symbol for first angle orthographic projection.

Simply so, What are the standard views used in a 3rd angle projection?

Third angle projection is one of the methods of orthographic projection used in technical drawing and normally comprises the three views (perspectives): front, top and side.

What is the difference between 1st and 3rd angle projection?

In third-angle projection, the view of a component is drawn next to where the view was taken. In first-angle projection, the view is drawn on the other end of the component, at the opposite end from where the view was taken.

## 21 Related Question Answers Found

### How do you construct a first angle projection?

– Step 1 – Begin by drawing light pencil lines to create the boxes that will contain the front elevation and the plan.
– Step 2 – Draw a 45º line from the front elevation box.
– Step 3 – Draw the front elevation in its box.
– Step 4 – Project lines from the front elevation to construct the plan.

### What is 1st & 3rd Angle Projection?

To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.

### What is the main difference between first angle and third angle projection?

For the first angle projection, place the object in the first quadrant and in the third quadrant for the third angle projection. The object is placed between the plane of projection and observer for the first angle projection and between the object and observer for the third angle projection.

### What is a 3rd angle projection?

3rd Angle project is where the 3D object is seen to be in the 3rd quadrant. It is positioned below and behind the viewing planes, the planes are transparent, and each view is pulled onto the plane closest to it. The front plane of projection is seen to be between the observer and the object.

### What does first angle projection mean?

First angle projection is a method of creating a 2D drawing of a 3D object. It is mainly used in Europe and Asia and has not been officially used in Australia for many years. In Australia, third angle projection is the preferred method of orthographic projection. Note the symbol for first angle orthographic projection.

### What is 3rd Angle Projection?

3rd Angle project is where the 3D object is seen to be in the 3rd quadrant. It is positioned below and behind the viewing planes, the planes are transparent, and each view is pulled onto the plane closest to it. The front plane of projection is seen to be between the observer and the object.

### Where is the third angle projection multiview system used?

Where is the third-angle projection multiview system used? The United States, Britain, and Canada. The rest of the world uses the first-angle project. The main difference between the first and third system is the position of the projection angle.

### What is 1st 2nd and 3rd angle projection?

To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.

### How do you find first angle and third angle drawings?

To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.

### What does 3rd angle projection mean?

3rd Angle project is where the 3D object is seen to be in the 3rd quadrant. It is positioned below and behind the viewing planes, the planes are transparent, and each view is pulled onto the plane closest to it. The front plane of projection is seen to be between the observer and the object.

### What is difference between first angle and third angle projection?

In third-angle projection, the view of a component is drawn next to where the view was taken. In first-angle projection, the view is drawn on the other end of the component, at the opposite end from where the view was taken.

### What is meant by angle of projection?

Answer: The angle at which an observer draw an object to convert it from 3D to 2D plane such as real object image to a plane paper is known as angle of projection. There are two angle of projection used in drawing: 1st angle of projection(first quadrant of coordinate plane)Jan 23, 2018

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