A cone has base radius 3 cm and height 4 cm. What is the lateral surface area, in square centimeters, of this cone? (A) $9\pi$ (B) $12\pi$ (C) $15\pi$ (D) $18\pi$ (E) $21\pi$
A cone has base radius 3 cm and height 4 cm. What is the lateral surface area, in square centimeters, of this cone?
\noindent(A) $9\pi$\\
(B) $12\pi$\\
(C) $15\pi$\\
(D) $18\pi$\\
(E) $21\pi$