A hemispherical dome covers a circular area of diameter 20 m. What is the approximate curved surface area of this dome?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 628 m2.
Radius = 20/2 = 10 m
Curved surface area of hemisphere = 2πr2 = 2 × 3.14 × 100 = 628 m2