(4) Find the ratio of TSA of hemisphere to the TSA of sphere they both have the same radius.
(5) The floor of a rectangular hall has perimeter 250 m the cost of painting the walls at the rate of 210 per  m2 and  Rs. 2400. Find the height of the hall. 

Dear Student,

Assuming the question is from NCERT exercise 13.1. Please find below the solution


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