"o captain! my captain! " walt whitman explain how whitman develops an extended metaphor in his poem.

whitman begins by comparing lincoln to the captain of a ship and his army to a boat. the metaphor honors lincoln and the army for defend and win the idea of freedom. whitman ends the poem by saying that lincoln, the captain, has died. the army and the united states have lost an important leader.

Whitman begins by comparing Lincoln to the captain of a ship and his army to a boat.

Explanation:

From the very start, Whitman calls Lincoln 'captain', and when he says, "our fearful trip is done," we understand that he means "mission accomplished". The line "The ship has weather’d every rack," is an obvious reference to his army. That's how he starts building up his extended metaphor.  

Orthographic Projection is used for making the projects but Isometric Projection is used to have better understanding of the object.

Orthographic drawings are typically two dimensional views of an object. For instance, if you were designing a table, you would draw a top view, side view and a bottom view. Should these three views not fully explain the design of the table other views would need to be drawn. When drawing an perspective view in an orthographic manner, you would utilize a 45 degree triangle for the lines that extend back or forward from the vertical lines. This type of perspective is not a true perspective because you can measure the true length of all the details shown. An isometric drawing is meant to depict a 3D image of an object in what appears to be a perspective view. However, similar to an orthographic perspective, all of the lines in an isometric drawing can be measured to their true length. What makes it different from an orthographic perspective is that its angled lines are drawn at 30 or 60 degrees or divisions of them. Drawing this by hand you would use a 30/60/90 triangle.

In either case, both types of perspectives can be accurately measured with a ruler in order to know the objects measurements.

Step-by-step explanation: