Distance between two points in space for JEE

Formula

\(PQ=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2}\)

Variables: \(P(x_1,y_1,z_1),\ Q(x_2,y_2,z_2)\).

Lengths, triangle geometry in 3D, collinearity checks, locus and section problems.