Question

27 solid iron spheres, each have radius 2 cm are melted to form a new solid sphere what will be the surface area of the sphere formed?

i know how to find the volume but i don't know how to find surface area......

Answer 1

the surface area will be πrh(r+h)

apply formula get answers.


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Answer 2

Answer:

surface area=458.2 sq 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