Asked by: Jaber Oettl
science space and astronomy

What is the first angle orthographic projection?

Last Updated: 5th March, 2020

First angle projection is a method of creating a2D drawing of a 3D object. It is mainly used in Europe andAsia and has not been officially used in Australia for many years.In Australia, third angle projection is the preferred methodof orthographic projection. Note the symbol for firstangle orthographic projection.

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Also asked, what is the difference between first angle and third angle orthographic projection?

To get the first angle projection, the object isplaced in the first quadrant meaning it's placedbetween the plane of projection and the observer. Forthe third angle projection, the object is placed below andbehind the viewing planes meaning the plane of projection isbetween the observer and the object.

One may also ask, what are the 3 main views of an orthographic drawing? Typically, an orthographic projection drawingconsists of three different views: a front view, atop view, and a side view. Occasionally, moreviews are used for clarity. The side view is usuallythe right side, but if the left side is used, it is noted in thedrawing.

Then, what is the use of first angle projection?

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

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

First of all, we use first angle andthird angle projection because it is assumed that theHorizontal plane is rotated CLOCKWISE to bring them in the sameplane (for drawing purpose) and if we use second or fourth angleprojection , then the Horizontal and vertical views willoverlap , creating confusions in their

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Giselle Jhonson


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 thirdquadrant. In 1st angle, the object is between the observerand the plane of projection. In 3rd angle, the planeis between the observer and the object.

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Which countries use first angle projection?

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

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What is third angle method?

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

Clementina Ritterskamp


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 angleprojection 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.

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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.

Levan Bertolez


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.

Zhongmin Apezetxea


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.

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What is isometric view in engineering drawing?

Isometric projection is a method for visuallyrepresenting three-dimensional objects in two dimensions intechnical 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.

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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: Thevelocity with which body is thrown is called the velocityof projection.

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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.

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What is projection and its types?

Orthographic Projection
In orthographic projection the direction ofprojection is normal to the projection of the plane.There are three types of orthographic projections− Front Projection. TopProjection.

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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.

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What is orthographic projection and why it is called so?

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

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What is a top 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.

Romaissa Knowler


What does orthographic mean?

orthographic. Something related toorthography — 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.

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What is orthographic drawing?

The definition of an orthographicprojection is a two-dimensional drawing of athree-dimensional object, using two or more additionaldrawings to show additional views of theobject.

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What is a perspective view?

Perspective view is a view of athree-dimensional image that portrays height, width, and depth fora more realistic image or graphic.

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What is the use of orthographic drawing?

Orthographic drawings can help to overcome thosechallenges. An orthographic drawing represents athree-dimensional object using several two-dimensional views of theobject. It is also known as an orthographic projection. Forexample, you can see in this image the front, top and side views ofan aircraft.

Nikoleta Revathi


What is a section view?

A section view is a view used on a drawingto show an area or hidden part of an object by cutting away orremoving some of that object. The cut line is called a“cutting plane”, and can be done in several ways. Thefollowing slides will help show the several methods or types of“section views