The total surface area of a closed hemisphere is 4158 cm2. What is the diameter of the hemisphere? [Use π = $\frac{22}{7}$]

14 cm 28 cm 42 cm 21 cm

42 cm

We know that, Total surface area of a hemisphere = 3πR2  According to the question, = 3 × (\(\frac{22}{7}\)) × R2 = 4158 = R2 = 4158 × (\(\frac{7}{66}\)) = R2 = 441 = R = 21 Diameter = 2 × 21 = 42cm