A two-dimensional figure is one that can be represented using two variables (usually x and y). In more common terms, it is called 'flat'.
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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 plain figure is a simple figure.
A solid figure.
figure math means figure math