Matematika B - 2015. jesen, 8.

A. $4 \pi \mathrm{~cm}^{2}$

B. $8 \pi \mathrm{~cm}^{2}$

C. $16 \pi \mathrm{~cm}^{2}$

D. $32 \pi \mathrm{~cm}^{2}$