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The Distance Formula:
Let P(x1, y1) and Q(x2, y2) are any two points on the line. We find the distance between P & Q.
For This draw PM and QN perpendicular to X–Axis. From P draw PR perpendicular to QN.
Consider the right angle triangle 
I. First we find the distance between P and R.
II. Secondly, we find the distance between R and Q.
III. Finally, we find the distance between P and Q.
By using Pythagorean Theorem
We have
OR
It is called distance formula.
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