Find the curved surface area of a right circular cone, if the radius of cone is \( 4 \mathrm{~cm...

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Find the curved surface area of a right circular cone, if the radius of cone is \( 4 \mathrm{~cm} \) and height of cone is \( 3 \mathrm{~cm} \).
a. \( 16 \pi \)
b. \( 18 \pi \)
c. \( 20 \pi \)
d. \( 4 \pi \)
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