To understand why the **2nd** and 4th **angle projection** system are **not used**. As per rule of **projection** when horizontal plane is rotated 90 degree in clockwise direction, top and front view will overlap. Overlapping **projection** views create confusion in the drawing. Therefore the **2nd angle projection** system is **not used**.

Then, What is isometric scale?

**Isometric Scale**. **Isometric** prjection is drawn using **Isometric scale**, which converts true lengths into **isometric** lengths which are foreshortened. (“Edges of an object are foreshortened” means that “the edges are cause to appear as if shortened”.)

Considering this, What is third angle? **Third Angle** projection is a method of orthographic projection which is a technique in portraying a 3D design using a series of 2D views.

**23 Related Questions and Answers Found 💬**

Table of Contents

**What is 1st and 3rd angle projection?**

In the **first angle projection** system, the objectplaced in the **first** quadrant and in **third angleprojection** system the object placed in the **third**quadrant. In **1st angle**, the object is between the observerand the plane of **projection**. In **3rd angle**, the planeis between the observer and the object.

**How many types of projection angles are there?**

we all know that we have two **types** of perspective to view object and draw on paper. One is called first **angle of projection** and another called third **angle of projection**. Here is the attached image.

**Which countries use first angle projection?**

**First Angle Projection** is commonly used in all**countries** other than United States. The Indian StandardInstitution (ISI) recommend the **use** of **First AngleProjection** method now in all the institutions.

**What is third angle method?**

**Third Angle** Projection is commonly used in UnitedStates of America. The difference or comparison between First**Angle** Projection and **Third Angle** Projection is welldescribed in next chapter. The object is imagined to be in**third** quadrant. The plane of projection lies between theobserver and object.

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

**First** of all, **we use first angle** and **third angle projection** because it **is** assumed that the Horizontal plane **is** rotated CLOCKWISE to bring them in the same plane (for drawing purpose) and if **we use** second or fourth **angle projection** , then the Horizontal and vertical views **will** overlap , creating confusions in their

**Why 2nd and 4th angle is not used?**

In **2nd and 4th angle** projection system, the topand front views are overlap to each other. In **2nd angle**projection system, the plane is in between object and observer. Theonly difference is that in **4th angle** of projection theobject is in between the observer and plane.

**What is isometric view in engineering drawing?**

**Isometric** projection is a method for visually representing three-dimensional objects in two dimensions in **technical** and **engineering drawings**. It is an axonometric projection in which the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees.

**What is an end view?**

A plan **view** is an orthographic projection of a3-dimensional object from the position of a horizontal planethrough the object. In other words, a plan is a section viewed fromthe **top**. In such **views**, the portion of the objectabove the plane is omitted to reveal what lies beyond.

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

To sum up, orthographic **projection** system **is used** to draw a three dimensional object in 2D plane. In **First angle projection**, the object lies in between observer and plane of **projection**. Whereas in the **third angle projection**, **projection** plane lies in between observer and Object.

**What is the difference between isometric and orthographic projection?**

An **isometric drawing** looks like an **isometricprojection** but all its lines are parallel to the three majoraxes. **Orthographic** drawings show a three-dimensional objectusing several two dimensional views of the object.

**What is the meaning of isometric drawing?**

A pictorial representation of an object in which allthree dimensions are **drawn** at full scale rather thanforeshortening them to the true **projection**. An **isometricdrawing** looks like an **isometric projection** but all itslines parallel to the three major axes are measurable.

**What is a top view?**

**Top View**. What you see when you look at something from directly above. Here is a **top view** of a camera. Also called a Plan **View**.

**What is 2nd angle projection?**

**What is meant by angle of projection?**

The **angle** between the initial velocity of a bodyfrom a horizontal plane through which the body is thrown, is knownas **angle of projection**. Regards. This conversation isalready closed by Expert. 0.

**What is 2nd angle projection?**

In **2nd** and 4th **angle projection** system,the top and front views are overlap to each other. In **2nd angleprojection** system, the plane is in between object and observer.When we turn the adjacent plane by 90 degree to see the top view,the front and top views are overlap to each other.

**Which angle projection is used in UK?**

Of the two methods the most widely **used** is Third **angle** orthographic **projection**. The symbol for Third **angle** is shown above.

**What is velocity of projection?**

Angle of **Projection**: The angle with thehorizontal at which the body is **projected** is called theangle of **projection**. **Velocity of Projection**: The**velocity** with which body is thrown is called the **velocityof projection**.

**Which angle of projection is most commonly used?**

The two orthogonal **projection** methods **used** internationally are first **angle projection** and third **angle projection**. Third **angle projection** (figure 1.2) is **used mainly** in The United States and Canada whilst first **angle projection** (figure 1.1) is **used mainly** throughout Europe and the rest of the world.

**What is isometric view in engineering drawing?**

**Isometric** projection is a method for visuallyrepresenting three-dimensional objects in two dimensions in**technical** and **engineering drawings**. It is anaxonometric projection in which the three coordinate axes appearequally foreshortened and the angle between any two of them is 120degrees.

**What is an end view?**

The term **orthographic** is sometimes reservedspecifically for depictions of objects where the principal axes orplanes of the object are also parallel with the **projection**plane, but these are better **known as** multiview**projections**. A lens providing an **orthographicprojection** is **known as** an object-space telecentriclens.

**What is a perspective view?**

The sine function reaches its largest output value, 1, with an input angle of 90 **degrees**, so we can see that for the longest-range punts 2θ = 90 **degrees** and, therefore, θ = 45 **degrees**. A projectile, in other words, travels the farthest when it is launched at an angle of 45 **degrees**.

**What is pictorial view?**

**Pictorial** drawing. A **view** of an object (actual or imagined) as it would be seen by an observer who looks at the object either in a chosen direction or from a selected point of **view**. **Pictorial** sketches often are more readily made and more clearly understood than are front, top, and side **views** of an object.

**What is projection theory?**

**Theory**of

**Projections**

**Projection theory**. In engineering, 3-dimensonal objects and structures are represented graphically on a 2-dimensional media. The act of obtaining the image of an object is termed “**projection**”. The image obtained by **projection** is known as a “view”.

**What is projection theory?**

**end** in **view**. A focus on the **end** goal or desired outcome. Although working on my thesis was overwhelming, I tried to keep the **end** in **view** and envisioned holding my degree. I don’t take these personnel decisions lightly—they are all made with the **end** in **view**. **See** also: **end**, **view**.

**Where does 1st angle projection place the right view?**

Explanation: **First angle projection** means the object **is** placed in **first** quadrant and the top **view** of the object **is** below the front **view** so the bottom **view is** above the front **view**. This **is** obtained as the bottom **view is** viewed from bottom and so **is projected** upwards.

**What is top view in engineering drawing?**

Horizontal plane of projection is the plane onto which the **Top View** of the multi-**view drawing** is projected. **Top view** of an object shows the width and depth dimensions.

**What is projection theory?**

Psychological **projection** is a defence mechanismin which the human ego defends itself against unconscious impulsesor qualities (both positive and negative) by denying theirexistence in themselves while attributing them toothers.

**What is projection and its types?**

**Projection**

In orthographic **projection** the direction of**projection** is normal to the **projection** of the plane.There are three **types** of orthographic **projections**− Front **Projection**. Top**Projection**.

**What angle gives the maximum range?**

Horizontal plane of projection is the plane onto which the **Top View** of the multi-**view drawing** is projected. **Top view** of an object shows the width and depth dimensions.

**What does orthographic mean?**

**orthographic**. Something related to**orthography** — the conventional spellings of a language— can be described as **orthographic**.**Orthographic** comes from the Greek roots ortho,**meaning** correct, and graphos, **meaning** writing. Thespelling of “a lot,” “people,” “to,” and “school” are allincorrect.

**What is orthographic drawing?**

The sine function reaches its largest output value, 1, with an input angle of 90 **degrees**, so we can see that for the longest-range punts 2θ = 90 **degrees** and, therefore, θ = 45 **degrees**. A projectile, in other words, travels the farthest when it is launched at an angle of 45 **degrees**.