The ratio of the total surface area of a sphere and a hemisphere of sa

1.	The ratio of the total surface area of a sphere and a hemisphere of same radius is :A. 2 : 1 B. 3 : 2 C. 4 : 1 D. 4 : 3
Answer» Option : (D) Total surface area of a sphere = 4πr² Total surface area of a hemisphere = 2πr² + πr² = 3πr² Ratio of the total surface area of a sphere and a hemisphere of same radius = 4 : 3

The ratio of the total surface area of a sphere and a hemisphere of same radius is :A. 2 : 1 B. 3 : 2 C. 4 : 1 D. 4 : 3

Answer»

Option : (D)

Total surface area of a sphere = 4πr²

Total surface area of a hemisphere = 2πr² + πr² = 3πr²

Ratio of the total surface area of a sphere and a hemisphere of same radius = 4 : 3