Quadrant - Definition, Graph, Cartesian Plane, Signs (2024)

Quadrant is the region enclosed by the intersection of the X-axis and the Y-axis. On the cartesian plane when the two axes, X-axis and Y-axis, intersect with each other at 90º and there are four regions formed around it, and those regions are called quadrants. So, every plane has four quadrants each bounded by half of the axes. Each quadrant is denoted by Roman numerals and named Quadrant I, Quadrant II, Quadrant III, and Quadrant IV based on their position with respect to the axes.

1.What is Quadrant?
2.4 Quadrants on Cartesian Plane
3.Quadrant Signs
4.Abscissa and Ordinate in Quadrants
5.How to Plot Points on Quadrants?
6.FAQs on Quadrants

What is Quadrant?

A quadrant can be defined as a region/part of a cartesian plane that is obtained when the two axes intersect each other. It is used to determine the position of a point in a plane. Observe the figure given below which shows a cartesian plane that is divided into 4 quadrants by the two axes.

4 Quadrant Graph

Here is the graph with four quadrants formed by the intersection of x and y axes that are intersecting at the origin.

Quadrant - Definition, Graph, Cartesian Plane, Signs (1)

4 Quadrants on Cartesian Plane

The X and the Y axes divide the cartesian plane into four graph quadrants:

  • First quadrant: It is on the upper right-hand corner of the plane. In this quadrant, both x and y-coordinates are positive.
  • Second quadrant: It is on the upper left-hand corner of the plane. In this quadrant, the x-coordinate is negative and the y-coordinate is positive.
  • Third quadrant: It is on the lower left-hand corner of the plane. In this quadrant, both x and y-coordinates are negative.
  • Fourth quadrant: It is on the lower right-hand corner of the plane. In this quadrant, the x-coordinate is positive and the y-coordinate is negative.

It should be noted that the quadrants are numbered in an anti-clockwise direction. The point where the X-axis and the Y-axis meet is called the origin. The values of x and y at the origin are (0,0).

Quadrant Signs

If we observe the horizontal axis 'x', as we move from left to right, we see that the value of the coordinates increases. Similarly, on the vertical axis 'y', as we go in the upward direction, the value goes on increasing. So, the sign convention of the four quadrants is expressed as shown in below:

QuadrantSigns
I(+, +)
II(-, +)
III(-, -)
IV(+, -)

The signs of the quadrants can be visualized in the figure below:

Quadrant - Definition, Graph, Cartesian Plane, Signs (2)

Abscissa and Ordinate in Quadrants

The numbers in the quadrant are expressed in the ordered pair (a, b) where 'a' is the x- coordinate and 'b' is the y-coordinate. To understand how to plot a point in the four quadrants, we need to observe the signs of an x-coordinate (also called abscissa) and a y-coordinate (also called ordinate). This gives an idea about the quadrant in which the given point lies. For example, we are given a point P (-4,6). Without even plotting it on a graph, by observing its sign (-ve, +ve) we can make out that it lies in quadrant II.

  • The abscissa gives information about the horizontal distance of the point from the Y-axis and its sign tells the direction, i.e., left or right. For example, abscissa = -4 means, starting from the origin, we need to go along the x-axis in a negative direction (left) up to 4 units.
  • The ordinate gives information about the vertical distance of the point from the origin and its sign tells the direction, i.e., above or below the origin. In the above example, ordinate = 6 means, starting from the origin, we need to go along the y-axis in a positive direction (up) up to 6 units.

How to Plot Points on Quadrants?

Let us learn how to plot points on quadrants with the help of the following example. Let us plot point D (5,-3) on a cartesian plane. First, observe the sign to identify its quadrant. The point is of the type (+ve, -ve) which lies in quadrant IV. Abscissa = 5; So, take a point P at a distance of 5 units from the origin on the right-hand side. Ordinate = -3; Now, move the point P vertically down by a distance of 3 units.

Quadrant - Definition, Graph, Cartesian Plane, Signs (3)

Important Notes on Quadrants:

  • In the cartesian system, a plane is divided into four regions by a horizontal line called X-axis and a vertical line called Y-axis. These four regions are known as quadrants.
  • The origin (0,0) lies on both X and Y axes. It doesn't belong to any quadrant.
  • X-coordinate is also called abscissa and the y-coordinate is also known as ordinate.

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FAQs on Quadrant

What is the Definition of Quadrant in Math?

A quadrant can be defined as a part of a cartesian plane that is obtained when the two axes intersect each other. We get 4 quadrants when the axes intersect each other.

How are Quadrants Numbered?

The 4 quadrants are numbered in the following way:

  • Quadrant I is on the upper right-hand corner of the plane.
  • Quadrant II is on the upper left-hand corner of the plane.
  • Quadrant III is on the lower left-hand corner of the plane.
  • Quadrant IV is on the lower right-hand corner of the plane.

Which Quadrant is Positive?

Quadrant I contains the positive values of x and y, so it is considered to be a positive quadrant. Other than this, quadrant II has negative x-coordinates and positive y-coordinates, quadrant III has both negative coordinates and quadrant IV contains the positive values of x but negative values of y.

What is the Use of Quadrants in Graphs?

The quadrants are used to explain the position of a point on the coordinate plane. For example, if someone says a point is located in quadrant II, immediately is understood that the x coordinate of the point is negative and its y-coordinate is positive.

What are the 4 Quadrants?

The x and the y-axes divide the plane into four graph quadrants. These are formed by the intersection of the x and y axes and are named Quadrants I, II, III, and IV. All the quadrants are different from each other based on the position and symbol of the x and y-coordinates.

Is Quadrant 4 Positive or Negative?

In quadrant 4, the x-coordinates are positive and the y-coordinates are negative.

Is Quadrant 1 Positive or Negative?

In quadrant 1, both x and y coordinates are positive. Hence, it is positive.

Quadrant - Definition, Graph, Cartesian Plane, Signs (2024)
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