A two-dimensional object is an object that can be drawn on a flat sheet of paper.
It's called "two-dimensional" because it has 2 dimensions . . . length and width,
but no height.
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You do not. You see it stereoscopically, but the brain compares the images with experience and assumes threedimensional interpretations. This can be used to fool people with optical illusions. Forms that are possible in a twodimensional world, but does not have a representation in 3D that makes sense.
1) Separate the vectors into components (if they are not already expressed as components). 2) Add each of the components separately. 3) If required, convert the vectors back to some other form. For twodimensional vectors, that would polar form.
A collection - of objects or concepts.A collection - of objects or concepts.A collection - of objects or concepts.A collection - of objects or concepts.
objects sink because they are to heavy.
They are sets of objects.