Orthographic projection: first and third angle

Choose a block, turn it in 3D and see the three orthographic views drawn as on an engineering drawing, switching between first angle and third angle layouts. Hidden edges are dashed.

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Questions students ask

What is the difference between first and third angle projection?

In first angle the plan is drawn below the front view and the view from the left goes on the right; in third angle the plan goes above and the view from the right goes on the right.

What are hidden lines?

Edges that are behind the surface you are looking at. They are drawn as short dashes.

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