$\sqrt{1089}$  

(a)  

 $\sqrt{324}$  

(a)  

 $\sqrt{8281}$  

(a)  

 $\sqrt{6724}$  

(a)  

 $\sqrt{1764}$  

(a)  

 $\sqrt{1681}$  

(a)  

 $\sqrt{2916}$  

(a)  

 $\sqrt{7225}$  

(a)  

 $\sqrt{1521}$  

(a)