Respuesta :

5 \/180 (please note that \/180 is the square root symbol I’m using
= 5 \/4 x \/45
= 5 x 2 \/9 x \/5
= 10 x 3 x \/5
= 30 \/5

I did this a couple of years ago in AS maths and I think this is how it’s done. Hope it’s helpful!