Find the squares of the following numbers using diagonal method:

Solution:

(i) 

$\therefore 98^{2}=9604$

(ii)

$\therefore 273^{2}=74529$

(iii) 

$\therefore 348^{2}=121104$

(iv)

$\therefore 295^{2}=87025$

(v)

$\therefore 171^{2}=29241$