To understand how analytic geometry is important and useful, First, We need to learn what a plane is?
If a flat surface goes on infinitely in both the directions, it is called a Plane. 
So, if you find any point on this plane, it is easy to locate it using Analytic Geometry.
Let’s figure out How?
It’s simple. You just need to know the two numbers of the coordinate geometry.
Definition of Analytic Geometry:
It is that branch of geometry in which the position of the point on the plane can be located using an ordered pair of numbers called as Coordinates. 
 What are the Coordinates?
Let’s understand it with the help of the box below.
A  B  C  
1  
2  x  
3 
In the above grid, The columns are labeled as A, B, C, and the rows are labeled as 1, 2, 3.
The location of letter x is B2 i.e. Column B and row 2. So, B and 2 are the coordinates of this box.
As there are several boxes in every column and rows, but only one box has the point X, and we can find its location by locating the intersection of row and column of that box.
 The coordinate Plane:
In coordinate geometry, every point is said to be located on the coordinate plane only.
Look at the figure below.
The above graph has xaxis and yaxis as it’s Scale. The xaxis is running across the plane and Yaxis is running at the right angle to the xaxis. It is similar to the box explained above.
Let’s learn more about Coordinates:
 Origin:
It is the point of intersection of the axis(xaxis and yaxis). Both x and yaxis are zero at this point.
 Values of the different sides of the axis:
xaxis – The values at the righthand side of this axis are positive and those on the lefthand side are negative.
yaxis – The values above the origin are positive and below the origin are negative.
 To locate a point
We need two numbers to locate a plane in the order of writing location of Xaxis first and Yaxis next. Both will tell the single and unique position on the plane. You need to compulsorily follow the order of the points on the plane i.e The x coordinate is always the first one from the pair. (x,y).
If you look at the figure above, point A has a value 3 on the xaxis and value 2 on the Yaxis. These are the rectangular coordinates of Point A represented as (3,2).
Analytical Geometry Formulas:
Graphs and coordinates are used to find measurements of geometric figures. There are many important formulas in Analytic Geometry.
Few of the important ones are being used to find Distance, Slope or to find the equation of the line.
The Analytical Geometry of Three Dimensions
In this, we consider triples (a,b,c) which are real numbers and call this set as three dimensional number space and denote it by R’. All the elements in the triple are called coordinates.
Let’s see how threedimensional number space is represented on a geometric space.
In threedimensional space, we consider three mutually perpendicular lines intersecting in a point O. these lines are designated coordinate axes, starting from 0, and identical number scales are set up on each of them.
Analytical Geometry Applications
Analytical geometry has made many things possible like the following:

 We can find whether the given lines are perpendicular or parallel.
 We can determine the midpoint, equation, and slope of the line segment.
 We can find the distance between the points.
 We can also determine the perimeter or the area of the polygon formed by the points on the plane.
 Define the equations of ellipse, curves, and circles.
Test your knowledge?
Question: What is the point of intersection of the axis(Xaxis and Yaxis) called as?
Answer: The point of intersection of the axis(Xaxis and Yaxis) called Origin h X and the Yaxis is 0 at this point.
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