Question

Prove that 2root3/5 is and irrational number​

Answer 1

yes,2 under root 3 upon 5 is an irrational number because :
   2 divided by 5 is 0.4.
   value of under root 3 is 1.73205080756............
    0.4 * 1.73205080756 = 0.69282032302....
     So , if you consider 2 under root 3 upon 5 is a irrational number because it is non terminating and non re-occuring.