This is one of the important topics covered in Class 10 Maths Chapter 7. Thus we need to find PQ. Take identical points for example d should be 0.
If two points have the same y-coordinate then the segment connected them is horizontal.
Derived from the Pythagorean Theorem the distance formula is used to find the distance between two points in the plane. Find the distance between the points -1 1 -2 2. For this take two points in XY plane as P and Q whose coordinates are P x1 y1 and Q x2 y2. Draw a right-angled triangle with the line formed by the points the distance between the two points can be calculated by finding the horizontal x 2 - x 1 and vertical.