Find magnitude | equation of vector of a vector joining two points using position vector

Equation of vector joining two points : If P1(x1, y1, z1) and P2(x2, y2, z2) are any two points, then the vector joining P1 and P2 Using the properties of vector addition, the above equation becomes P1P2 vector =OP2 - OP1 The magnitude of vector P1P2 vector is given by root {(x2 - x1)^2 + (y2 -y1)^2 + (z2 - z1)^2}