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16 December, 18:46

6. A hemispherical dome of a building needs to be

painted. if the circumference of the base of the dome

is 17.6 m, find the cost of painting it, given the cost of

painting is Rs. 5 per 100 cm2

+3
Answers (1)
  1. 16 December, 22:45
    0
    Step-by-step explanation:

    circumference=17.6 m

    2πr=17.6

    2*22/7*r=17.6

    44/7 r=17.6

    r=17.6*7/44=0.4*7=2.8 m=280 cm

    surface area=1/2 (4 πr²) = 2πr²=2*22/7 * (280) ²=2*22/7*280*280

    =44*40*280

    =492800 cm²

    cost of painting=492800*5:100=24640 Rs.
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