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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.
All geometric figures.
Because otherwise you are using figures which imply an accuracy that cannot be justified.
61.37795276 in four significant figures is 61.38
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.