Answers

2016-03-07T19:36:01+05:30
Given that 
in the cylinder
radius = 12 cm
height = 20 cm
volume of the cylinder = πr²h
= π × 12 × 12 × 20
after the orange is thrown 
in the cylinder
radius = 12 cm
height = 26.75 cm
volume of the cylinder = π × 12 × 12 × 26.75
then 
the volume of the sphere = volume of the cylinder of second - volume of the cylinder
= π ×12×12×26.75 - π×12×12×20
= π×12×12(26.75 - 20)
= π×12×12×6.75
volume of the sphere = π×12×12×6.75
4/3 πr³ = π×12×12×6.75
r³ = 729
r = 9 cm    
the radius is 9 cm
surface area of the sphere = 4 π r²
= 4 × 22/7 × 9 × 9
=  1018.285 cm²
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