The axes of a twodimensional Cartesian plane system divides the plane into four infinite regions is called quadrants. These regions includes both positive and values values of x and y. The intersection of two lines is known to be the reference point. All the measurement is done taking this point as the reference (or starting point).
Well, the graph is divided into sections or four quadrants, based on those values.
1st Quadrant: The upper righthand corner of the graph is the first quadrant. In this quadrant the values of x and y both are positive.
2nd Quadrant: The upper lefthand corner of the graph is the second quadrant. In this quadrant the value of x is negative whereas the value of y is positive.
3rd Quadrant: The lower lefthand corner of the graph is the third quadrant. It contains the negative values of both x and y.
4th Quadrant: Finally, the fourth quarter is at the lower righthand corner, that has positive value of x and negative values of y.
Quadrant 
xcoordinate 
ycoordinate 
1st Quadrant 
Positive 
Positive 
2nd Quadrant 
Negative 
Positive 
3rd Quadrant 
Negative 
Negative 
4th Quadrant 
Positive 
Negative 
Trigonometric values in different Quadrant:
1st Quadrant 
2nd Quadrant 
3rd Quadrant 
4th Quadrant 

Sin 
+ve 
+ve 
ve 
ve 
Cos 
+ve 
ve 
ve 
+ve 
Tan 
+ve 
ve 
+ve 
ve 
Cot 
+ve 
ve 
+ve 
ve 
Sec 
+ve 
ve 
ve 
+ve 
Cosec 
+ve 
+ve 
ve 
ve 
Plotting Points on a Graph:
Cartesian points are written as x – y axis. To graph a point, In order to locate its position on the xaxis, find its location on the yaxis, and in the end plot where these meet. The center point of the graph is called the “origin” and is written as the point (0, 0) because it is located at the zero point on the both x and y axis.
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