Question

The total surface area of a hemisphere of radius r is

विकल्प

• \[\pi r^2\]

   

• 2 \[\pi r^2\]

   

• 3 \[\pi r^2\]

• 4 \[\pi r^2\]

Answer 1

The curved surface area of a hemisphere of radius r is

2 \[\pi r^2\]  So, the total surface area of a hemisphere will be the sum of the curved surface area and the area of the base.

Total surface area of a hemisphere of radius r =

2 \[\pi r^2\] + \[\pi r^2\] 

=3 \[\pi r^2\]