CBSE Class 9 Answered
A hemispherical dome, open,at base is made from a sheet of fibre, if diameter of hemispherical dome is 80cm and 13/170 of fibre sheet actually used was wasted in making the dome, then find the cost of dome at the rate of rupees 35 per 100 square cm.
Asked by Amoolya Kamuni | 30 Mar, 2014, 08:51: PM
Expert Answer
Given, Diameter of the hemispherical dome = 80 cm
=> Radius of the hemispherical dome = 40 cm
We need to find the Curved Surface area of the hemispherical dome to find the cost of the sheet of the fibre.
Curved Surface Area of a hemisphere =
Let the area of the sheet of fibre used to make the dome = x sq cm
Since of the fibre sheet was wasted,
Rate of the fibre sheet = Rs 35 per 100 sq cm
=> Cost of the sheet used to make the dome =
Answered by | 31 Mar, 2014, 11:30: AM
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