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Assertion (A): The curved surface area of a right circular cone of radius $3.5$ cm and slant height $4$ cm is $44$ sq cm.
Reason (R): The curved surface area of a right circular cone of radius $r$ and slant height $l$ is $\pi rl$.
Reason (R): The curved surface area of a right circular cone of radius $r$ and slant height $l$ is $\pi rl$.
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(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).