While drawing projections if a triangle is parallel to horizontal plane, top should be drawn first and projections are drawn to it to get front view.

Projection of Planes topics include: Planes basics, planes projection and oblique plane projections. A projection plane, or plane of projection, is a type of view that shows where graphical projections from an object intersect. It's an imaginary flat plane that an image is projected onto. The projection is created by connecting the points where the lines of sight pierce the projection plane. This transforms the 3D object into a 2D view.  Projection planes are often used in descriptive geometry and graphical representation. A picture plane in perspective drawing is a type of projection... Show more

Projection of Planes topics include: Planes basics, planes projection and oblique plane projections.

A projection plane, or plane of projection, is a type of view that shows where graphical projections from an object intersect. It's an imaginary flat plane that an image is projected onto. The projection is created by connecting the points where the lines of sight pierce the projection plane. This transforms the 3D object into a 2D view. 
Projection planes are often used in descriptive geometry and graphical representation. A picture plane in perspective drawing is a type of projection plane.
The three principal planes of projection used in orthographic projection are the frontal plane, horizontal plane, and profile plane. The projection on the profile plane is called the side view or end view. 

Related: Engineering Drawing Practice Test: Projection of Lines

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