= πr  h^{2} + r^{2}  (∵ l =  h^{2} + r^{2}  ) 
= π × 12 ×  5^{2} + 12^{2}  = π × 12 ×  169  = π × 12 × 13 = 156π m^{2} 
= π × 12 ×  169  = π × 12 × 13 = 156π m^{2} 
Volume of each small sphere =  Volume of big sphere 
Number of small sphere 
⇒ 

= 


64  
⇒ r^{3} =  (4)^{3}  = 1 
64 