Dimensions applying to two adjacent views should be placed between views, unless clarity is promoted by placing some of them outside.
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Two.
It's true that a point has no dimensions. But a line has one dimension, not two. A plane has two dimensions, a solid has three, and that's about all that ordinary people can visualize.
relative and polar
One dimension is a line. It has length, nothing else. Picture a number line. Two dimensions is a plane. It has length and width. Picture a graph.
Two dimensions of length: [L2]