It is a line. A line has a midpoint, and other locations defined from the midpoint, but is infinitely long.
A line.
A rectangle.
a plane
A cylinder is not a 2D object because it has three dimensions - length, width, and height. It has a circular base and a curved surface, which give it depth. A 2D object would only have two dimensions and would lack any depth or thickness.
Any shape of three or more dimensions. A flat shape, such as a tray, has a thickness - however small - and so is technically a 3-d object.
This is another definition of a line. It has only one dimension: infinite length.
A ray.
A line.
Height (thickness or dept) Width Length
A rectangle.
a plane
its called a plane
Dimension in this case refers to how many "directions" an object has. One dimensional means something that only extends in one direction, like a line. Two dimensions is a surface, it has a width and a length, but no thickness. Thress dimensional is like most stuff we have around us, things with length, width, and height.
A cylinder is not a 2D object because it has three dimensions - length, width, and height. It has a circular base and a curved surface, which give it depth. A 2D object would only have two dimensions and would lack any depth or thickness.
Hi dear, it is enough to draw incident rays parallel to principal axis. That ensures that the object is at infinity and no need to draw an object at all.
density
Any shape of three or more dimensions. A flat shape, such as a tray, has a thickness - however small - and so is technically a 3-d object.