Determine the total surface area of a hemisphere closed at bottom. Radius of the hemisphere is $\sqrt{\frac{25}{\pi}}$ unit.
Answer & explanation
Correct answer: option 1
We know that,
TSA of hemisphere = 3πr2
We have,
Radius of the hemisphere = $\sqrt{\frac{25}{\pi}}$ unit.
According to the question,
TSA = 3π [$\sqrt{\frac{25}{\pi}}$]2
= TSA = 3π × \(\frac{25}{ π }\) = 3 × 25 = 75 unit2