In this question the diameter of a sphere is given to us as 28 cm, and we have to find the cost of painting it all around at Rs. 0.10 per square cm. This is a very common questions from Mensuration chapter class 9th almost every student got stuck in these kind of questions please help me and solve this question.

AnilSinghBoraGuru

# The diameter of a sphere is 28 cm. Find the cost of painting it all around at Rs. 0.10 per square cm.

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surface area of sphere is 4*pie*square of radius

and you took 4/3*pie*square of radius