question_answer

A solid sphere of radius r cm is bisected along two perpendicular planes. The total surface area (in                                                                                           \[\text{c}{{\text{m}}^{\text{2}}}\] ) of the 4 pieces formed, is

A)                                                                                   \[\text{4 }\pi \text{ }{{\text{r}}^{\text{2}}}\]

B)                                                                                   \[\text{6 }\pi \text{ }{{\text{r}}^{\text{2}}}\]

C)                                                                                          \[\text{8}\pi {{\text{r}}^{\text{2}}}\]  

D)                                                                                 \[\text{12 }\pi \text{ }{{\text{r}}^{\text{2}}}\]