Q. 154.5( 11 Votes )
If two solid hemispheres of same base radius 
are joined together along their bases, then curved surface area of this new solid is
A. 4πr2
B. 6πr2
C. 3πr2
D. 8πr2
Answer :
When two hemispheres are joined together along their bases, a sphere of same base radius is formed.
And Curved surface area of sphere is 4πr2.
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