Question

#
Distance between two points: If P(x_{1}, y_{1} z_{1}) and Q(x_{2}, y_{2}, z_{2}) are two points in space, then prove that distance

Solution

**PROOF:**Complete the cuboid PABCQRST as shown in figure.

Since

So,

...(i)

Again,

So,

[By (i) and ]

Hence,