having dimensions of height and width only. In a literary sense, shallow, superficial and unconvincing characters
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Many simple two-dimensional figures are described using its length and width. Weight only refers to 3D objects as well does volume.
Some synonyms for star-shaped figures include asteroform, stellate, stelliform, astromorphic and multi-pointed. Star-shaped figures could also be described as polygons.
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.
All congruent figures are similar figures, and have identical sizes.
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.