In AutoCAD drawing using Absolute Coordinates, the number of points needed to draw a line is

Explanation:

Coordinate system

• To specify a point in a plane, take two mutually perpendicular lines as reference.
• The horizontal line is called X-axis and the vertical line is called Y-axis.
• The point of intersection of two axes is known as the origin.
• The X and Y-axis divide the X-Y plane into four parts generally known as quadrants.
• This method of specifying points is called a cartesian coordinate system.

AutoCAD uses the following 2 coordinate systems to locate a point in an X-Y plane.

Absolute coordinate system

• In the absolute coordinate system, the points are located with respect to the origin (0,0).
• For example, a point with X = 4 and Y = 3 is measured 4 units horizontally and 3 units vertically from the origin.
• We need two points to draw a line in the absolute coordinate system.
• In AutoCAD, the absolute coordinates are specified by entering X and Y coordinates, separated by a comma.

Relative coordinate system

There are two types of relative coordinate systems.

• Relative rectangular coordinates
  • In the relative rectangular coordinate system, the displacement along the X and Y axis are measured with reference to the previous point rather than the origin.
  • In AutoCAD, the relative coordinate system is designated by the symbol @ and it should precede any relative entry.
• Relative polar coordinate
  • In the relative polar coordinate, a point is located by defining both the distance of the point from the current point and the angle that the line between two points makes with the positive X-axis.