The correct answer to this question is shape.
The main dimensions of the shapes are width and length. There are seven main elements of arts, which include shape, color, line, texture, tone, form, and value. The other six elements work together by giving the shape its boundaries.
Lines are what forms shapes. For example, shapes like a square are formed from four-line joined together, while a triangle is formed by joining three lines together. There are different types of shapes, which include square, circle, triangle, rhombus, trapezium, rectangle, crescent, cylinder, cube, cuboid, pyramid, cross, and so on.
In summary, always put it in mind that when you hear about a 2-D area enclosed by a line that establishes contour, the simple answer is a shape.