Question

. 27 solid iron spheres, each of radius 2 cm are
melted to form a new solid sphere. What will
be the surface area of the new sphere?​

Answer 1

Answer:

surface area = 458.2 sq. cm

Step-by-step explanation: volume of sphere x 27 = volume of big sphere

                                            =>27 x 4/3 $\pi$ r^3 = 4/3 x $\pi$ x r^3

                                           =>216 = r^3

                                           => r = 6 cm

surface area volume = 4 x $\pi$ x r^2

                                     = 4 x 22/7 x 6 x 6

                                     = 458.2 sq cm

Answer 2

Answer:

surface  area =458.2sq cm

Step-by-step explanation:

Step-by-step explanation: volume of sphere x 27 = volume of big sphere

                                           =>27 x 4/3  r^3 = 4/3 x  x r^3

                                          =>216 = r^3

                                          => r = 6 cm

surface area volume = 4 x  x r^2

                                    = 4 x 22/7 x 6 x 6

                                    = 458.2 sq cm