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Assertion (A): If the total surface area of a solid hemisphere is $462$ cm$^2$, then its radius is $7$ cm. Reason (R): The total surface area of a solid hemisphere of radius $r$ is $3\pi r^2$.
- (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- (c)Assertion (A) is true, but Reason (R) is false.
- (d)Assertion (A) is false, but Reason (R) is true.
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(A) Both Assertion(A) and Reason(R) are true and Reason(R) is the correct explanation of Assertion(A).