Dimension lines are dynamic objects. This powerful feature means that no matter how you transform (move, rotate, skew, or scale) a dimension line, Designer will accurately calculate its length.
Transforming a dimension line does not change the line's aligned, horizontal, or vertical definition. For example, a horizontal dimension line continues to measure the horizontal distance between its endpoints, even when rotated into a vertical position (of course, the horizontal distance between two vertically aligned points is zero).