Question

a hemispherical bowl made of iron has inner diameter 14 cm and of negligible thickness. Its inner and outer surface areas are to be printed at the rate of 8 rupees per 100 cm². Find the cost of painting.​

Answer 1

hey this is the answer of some other question so don't get confused

Answer

d=10.5cm

r=

2

d

=

2

10.5

=5.25

Curved surface area of hemisphere=2πr

2

=2π(5.25)

2

=173.25cm

2

Cost of tin plating 100cm

2

=16Rs

Cost of tin plating 1cm

2

=

100

16

Rs

Cost of tin plating 173.25cm

2

=

100

16

×173.25=27.72Rs

Cost of tin plating=27.72Rs