Find the total surface area of a closed hemisphere whose diameter is 7 cm.
Answer & explanation
Correct answer: option 4
We know that,
The total surface area of hemisphere = 3πr2
The diameter of hemisphere = 7 cm
Here, radius = \(\frac{7}{2}\) cm
Total surface area of the hemisphere = 3 × (\(\frac{22}{7}\)) × \(\frac{7}{2}\)2 = 115.5 cm2