The volume of a solid hemisphere is 19404cm³. Its total surface area…

Volume of a hemisphere = 19404

⇒ \(\frac{2}{3}\) \(\pi \)r³ = 19404

⇒ r³ = \(\frac{19404 × 3 × 7}{2 × 22}\)

⇒ r³ = 9261

⇒ r³ = \(\sqrt[3]{9261}\) = 21 cm

Total surface area = 2\(\pi \)r² + \(\pi \)r²

                   

= 3\(\pi \)r² 

= 3 × \(\frac{22}{7}\) × 441 = 4158 cm²