You are very much interested in Humanities subjects. Unfortunately these had been dropped from your school as no one was opting for it. After having a conversation with some of your friends, you decide to highlight this matter. Write a letter in 120-150 words to the principal of your school reguesting him to re-introduce the Humanities stream at the Senior Secondary level. (6)
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Solution :-
The diameter of a sphere is 28cm
As we know that ,
Radius = Diameter / 2
Radius = 28/2
Radius = 14cm
Thus, The radius of the sphere is 14cm
As we know that,
Total Surface area of sphere = 4πr^2
Put the required values,
TSA of sphere
= 4 * 22/7 * 14 * 14
= 4 * 22 * 2 * 14
= 4 * 44 * 14
= 4 * 616
= 2464cm^2
Thus, The TSA of the sphere is 2464cm^2
Now,
Cost of painting per cm^2 = 0.10
Therefore,
The cost of painting 2464 cm^2
= 0.10 * 2464 = Rs
Hence, The total cost of painting the sphere it all around is Rs 246.4..
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