Quadrant
Quadrant is the region enclosed by the intersection of the Xaxis and the Yaxis. On the cartesian plane when the two axes, Xaxis and Yaxis, intersect with each other at 90^{º} 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.
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 righthand corner of the plane. In this quadrant, both x and ycoordinates are positive.
 Second quadrant: It is on the upper lefthand corner of the plane. In this quadrant, the xcoordinate is negative and the ycoordinate is positive.
 Third quadrant: It is on the lower lefthand corner of the plane. In this quadrant, both x and ycoordinates are negative.
 Fourth quadrant: It is on the lower righthand corner of the plane. In this quadrant, the xcoordinate is positive and the ycoordinate is negative.
It should be noted that the quadrants are numbered in an anticlockwise direction. The point where the Xaxis and the Yaxis 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:
Quadrant  Signs 

I  (+, +) 
II  (, +) 
III  (, ) 
IV  (+, ) 
The signs of the quadrants can be visualized in the figure below:
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 ycoordinate. To understand how to plot a point in the four quadrants, we need to observe the signs of an xcoordinate (also called abscissa) and a ycoordinate (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 Yaxis 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 xaxis 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 yaxis 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 righthand side. Ordinate = 3; Now, move the point P vertically down by a distance of 3 units.
Important Notes on Quadrants:
 In the cartesian system, a plane is divided into four regions by a horizontal line called Xaxis and a vertical line called Yaxis. 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.
 Xcoordinate is also called abscissa and the ycoordinate is also known as ordinate.
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Examples on Quadrant

Example 1: Write the coordinates of points A and B given in the graph and identify the quadrant in which each of them lies.
Solution: Distance of A from yaxis = OP = 3 units on its left. Therefore, Abscissa = 3. Distance of A from xaxis = AP = 4 units above it. Therefore, Ordinate = 4. Similarly, the distance of B from yaxis = OM = 4 units on its right. Therefore, Abscissa = 4. Distance of B from xaxis = BM = 3 units below it. Therefore, Ordinate = 3. The answer to the above problem can be recorded in a tabular form.
Point Coordinates Quadrant A (3, 4) II B (4, 3) IV 
Example 2: Locate the points M (3, 0), N (3,5), and P (3, 2) on a cartesian system and check if they are collinear.
Solution: Let us plot the points M, N, and P on a graph. To know whether the three points are collinear or not, we need to draw a line passing through any two of them. If the third point also lies on that line, then the points will be collinear.
We can observe that line 'l' contains all three points. Therefore, M, N, and P are collinear points.
Answer: The given points are plotted and are found to be collinear.

Example 3: State true or false:
a.) The first quadrant is on the upper righthand corner of the plane.
b.) In Quadrant III, both x and ycoordinates are negative.
Solution:
a.) True, the first quadrant is on the upper righthand corner of the plane.
b.) True, in Quadrant III, both x and ycoordinates are negative.
Answer: (a) True (b) True
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 righthand corner of the plane.
 Quadrant II is on the upper lefthand corner of the plane.
 Quadrant III is on the lower lefthand corner of the plane.
 Quadrant IV is on the lower righthand 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 xcoordinates and positive ycoordinates, 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 ycoordinate is positive.
What are the 4 Quadrants?
The x and the yaxes 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 ycoordinates.
Is Quadrant 4 Positive or Negative?
In quadrant 4, the xcoordinates are positive and the ycoordinates are negative.
Is Quadrant 1 Positive or Negative?
In quadrant 1, both x and y coordinates are positive. Hence, it is positive.
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