Find the total surface area of a solid hemisphere whose radius is 4.2 cm. (Take π=22/7)
Answer & explanation
Correct answer: option 3
We know that,
Total surface area of hemisphere = 3πr2
We have,
Radius of hemisphere = 4.2 m
Total surface area of hemisphere = 3 × \(\frac{22}{7}\)× 4.2 × 4.2
= 3 × \(\frac{22}{7}\)× 17.64 = 166.32 cm2