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

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.