The volume of the hemisphere is 19,404 cm3. The radius of the hemisphere is __________.
Answer & explanation
Correct answer: option 3
We know that,
Curved surface area of hemisphere = 2πr2
Total Surface area of hemisphere = 2πr2 + πr2 = 3πr2
Volume of hemisphere = \(\frac{2}{3}\) πr3
\(\frac{2}{3}\) πr3 = 19404
= r = 21 cm
So, the total surface area = 3 × \(\frac{22}{7}\) × (21)2 = 4158 cm