# The perimeter of the triangle with vertices at $(1,0,0),(0,1,0)$ and $(0,0,1)$ is :

$\begin {array} {1 1} (1)\;3 & \quad (2)\;2 \\ (3)\;2 \sqrt 2 & \quad (4)\;3 \sqrt 2 \end {array}$

$(4)\;3 \sqrt 2$