A cubical block of side 10 cm is surmounted by a hemisphere what is the largest diameter that the hemisphere can have find the cost of painting the total surface area of the solid so formed at the rate of rupees 5 per 100 cm square
Answers
Answer: Cost of painting is rupees 33.93
Step-by-step explanation: The largest diameter that the hemisphere can have is 10 cm.
surface area of the cube(except the upper part) is : 5 x 10 x 10
= 500
surface area of the hemisphere: 2 x 22/7 x 5 x 5
= 1100/7
Part that is left beside the hemisphere on the cube(on top)
= 10 x 10 - 22/7 x 5 x 5
= 100- 550/7
= 150/7
Total surface area of the solid is : 500+1100/7+150/7
= 500+1250/7
= 4750/7
Rate of painting is : 4750/7 x 5/100
= 33.93