Maths · Determining areas of the regions bounded by simple curves in standard forms
It cost Rs 4020 to paint the inner curved surface area of hemisphere of radius 8
It cost Rs 4020 to paint the inner curved surface area of hemisphere of radius 8 \( m \). If it is painted at rate of Rs. 10 per \( m^{2} \). Find inner curved surface.
- A. \( 402 m^{2} \)
- B. \( 400 \mathrm{m}^{2} \)
- C. \( 200 m^{2} \)
- D. \( 201 m^{2} \)
Step-by-step solution
The cost to paint the inner curved surface is Rs 4020 at a rate of Rs 10 per m^2. So, the area = cost / rate = 4020 / 10 = 402 m^2.
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