One dimension means you only need to measure once. A line is a good example. It has only one measure - length. ■
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Surface area of three dimensional figures are measured in square units whereas their volumes are measured in cubic units
A line segment is the only one-dimensional figure.
A line.
length times(x) width * * * * * Very few 2-dimensional figures are measured by length and width - rectangles (and stretching the terminology) triangles and parallelograms. Certainly not circles, stars, irregular polygons, other irregular shapes.
Figures that have no perimeter such as a strairght line or the arc of a circle