Question

A building is in the form of a hollow hemisphere of outer radius 100 m and thickness of wallis 1 m. If cost of painting 1 sq.m. ia Rs. 5 then total cost of painting both the outer and innerwalls of the building is​

Answer 1

Answer:

Rs 621751.4

Step-by-step explanation:

Surface Area of Hemisphere = 2 π r²

Outer area = 2 π 100²

inner Area =  2 π (100-1)²  = 2 π 99²

Total area to be painted = 2 π 100² + 2 π 99²

= 2 * 3.14 * 19801

= 124350.25 m²

cost of painting 1 sq.m. isa Rs. 5

=>  total cost of painting both the outer and innerwalls of the building is​

= 5 * 124350.25 m²

= 621751.4