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Q.

State true or false.


Two identical solid hemispheres of equal base radius r cm are stuck together along their bases. The total surface area of the combination is 6π r 2  .


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a

True

b

False 

answer is B.

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Detailed Solution

Given statement is two identical solid hemispheres of equal base radius r cm are stuck together along their bases.
The total surface area of the hemisphere is 2π r 2  .
When two similar solid hemispheres with equal bases are adjoined from base, a new solid generated that is, sphere and the total surface area of sphere is 4π r 2  .
Thus, the statement is false, and the total surface area of the combination is not equal to 6π r 2  .
Therefore, 2 is the correct option.
 
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