👉 The term "equisurface" refers to a surface that is defined by two or more lines that are parallel and intersect at exactly one point. In other words, an equisurface is a surface that can be divided into two equal parts by two or more lines. Equisurfaces can also be called "half surfaces" because they are formed when the plane containing them intersects the two-dimensional Cartesian coordinate system in half a circle. For example, consider the surface of a sphere (or any
