The total surface area of a hemisphere having radius r is _____ .
A
4πr2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
3πr2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
2πr2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
52(πr2)
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is B3πr2
We know that, surface area of a sphere of radius r is 4πr2. Hence, the curved surface area of the hemisphere is 2πr2. The area of the flat circular surface of radius r is πr2.
Hence, the total surface area of the hemisphere =2πr2+πr2=3πr2