Theory:

"Where there is matter, there is GEOMETRY".
 
-Johannes Kepler
In previous classes, we are familiar with two-dimensional coordinate geometry. We started learning about coordinate axes, coordinate planes, display points in a plane, and distance between two points and section formulae. These are the fundamentals of coordinate geometry. Now, we are going to see analytical geometry.
The combination of analysis and geometry is referred to as analytical geometry.
Inclination of a line
The angle formed between a straight line and the positive direction of the \(X\)-axis in the anti-clockwise direction is called an inclination of a line or the angle of inclination of a line. It is usually denoted by \(\theta\).
graph1.png
 
Important!
(i) The inclination of the \(X\)-axis and every line parallel to the \(X\)-axis is \(0^\circ\).

(ii) The inclination of the \(Y\)-axis and every line parallel to the \(Y\)-axis is \(90^\circ\).