A hemispherical bowl has radius of its rim equal to 2-1 cm. The total capacity of 20 such bowls is nearly equal to
(a) 388 cm
(b) 360 cm
(e) 430 cm
(d) 424 em
Answers
Answered by
4
Inner radius=24.7cm
Thickness=0.3cm
Outer radius=(24.7+0.3)cm
=25cm
outer surface area of bowl=2πr
2
=2×3.14×25×25
=3925cm
2
cost of polishing 10cm
2
surface area=Rs.4
∴ cost of polishing 3925cm
2
surface area=
10
4×3925
=Rs.1570
Similar questions