👉 Ridge, in mathematics and statistics, is a special type of line that divides an area into two halves. It is often used in geometry to define the boundaries between parallel lines or planes. For example, if we have two lines that are not parallel but intersect at their intersection point, then they will divide the plane into two parts: one part above the line (the "upper" half) and another part below the line (the "lower" half). This is called a ridge of the