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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

Respuesta :

Answer:

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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