Answer :

The rocket is in the form of cylinder closed at the bottom and cone on top.


Height of cylindrical part rocket = h = 21 m


Base radius of rocket = r = 2.5 m


Surface Area of cylindrical part of rocket = 2πrh + πr2


= 2 × 22/7 × 2.5 × 21 + 22/7 × 2.5 × 2.5 m2


= 330 + 19.64 m2 = 349.64 m2


Slant height of cone = l = 8 m


Surface Area of conical part of the rocket = πrl


= 22/7 × 2.5 × 8 m2


= 62.86 m2


Total surface area of the rocket = Surface Area of cylindrical part of rocket + Surface Area of conical part of rocket


Total surface area of the rocket = 349.64 + 62.86 m2 = 412.5 m2


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