The internal and external diameters of a hollow hemispherical vessel are 24 cm and 25 cm
respectively. The cost to paint 1 cm of the surface is 7 paise. Find the total cost to paint the vessel
all over (ignore the area of the edge).
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=2πR
2
+2πr
2
+π(R
2
−r
2
)
=π(2R
2
+2r
2
+R
2
−r
2
)
=π(3R
2
+r
2
)
=
7
22
(3×12.5
2
+12
2
)
=
7
22
(468.75+144)
=
7
22
×612.75
=1925.78sq.cm
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