Twenty seven solid iron spheres, each of radius r and surface area S are...

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Twenty seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S′. Find the (i) radius r′ of the new sphere, (ii) ratio of S and S′. class 9 maths chapter 11 surface areas and volumes exercise 11.4 question no 9


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CASE-STUDY 1 Sarita donated some amount to a blind school. The amount of...

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