Distance between two points (x1,y1) and (x2,y2) is given by: P Q = ( x 2 − x 1) 2 + ( y 2 − y 1) 2 It is known as distance formula. Observe that (x2– x1)2 is the square of the difference in x – coordinates of P and Q and is always positive. The

Distance Formula: The distance between two points A(xA, yA) A ( x A, y A) and B(xB, yB) B ( x B, y B) in two-dimensional Cartesian coordinate plane is the length of the segment connecting them, AB = d(A, B) = √(xB − xA)2 + (yB − yA)2 A B =