Assertion (A): If we join two hemispheres of same radius along their bases, then we get a sphere.

Reason (R): Total Surface Area of a sphere of radius $r$ is $3\pi r^2$.

Question

Assertion (A): If we join two hemispheres of same radius along their bases, then we get a sphere.

Reason (R): Total Surface Area of a sphere of radius $r$ is $3\pi r^2$.

Accepted Answer

Step 1: Assertion (A) is true: joining two hemispheres along their bases gives a sphere. Reason (R) is false: TSA of a sphere is $4\pi r^2$, not $3\pi r^2$.

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