The internal and external diameters of a hollow hemispherical vessel are 20 cm and 28 cm respectively. find the cost of painting the vessel all over at 15 paisa per cm2
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Area to be painted = inner curved surface area + outer curved surface area
= 2*22/7*10*10 + 2*22/7*14*14
=628.57+ 1232
= 1860.57
Cost of painting = 15 p*1860.57
= 27908.55
=27908.55/100
=Rs 279.0855
= 2*22/7*10*10 + 2*22/7*14*14
=628.57+ 1232
= 1860.57
Cost of painting = 15 p*1860.57
= 27908.55
=27908.55/100
=Rs 279.0855
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