Question

an open cylindrical tank is 4.2 M Deep and its base radius is 84 CM if the tank is made up of plastic sheet find the cost of the open tank at 185 per metre square

Answer 1

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Answer 2

As we know tank hasonly one part covered

Area of tank = 2πrh + πr^2

r= 84cm = 0.84 m

h= 4.2 m

A=2×22/7 ×.84×4.2 + 22/7 × 0.84×0.84

=22/7× 0.84( 8.4 +0.84 )

=22/100 × 12 ( 9.24)

=(22×12×9.24)/ 100

=24.39 sqm

cost 1 sqm is 185

so cost of 24.39 ×185

= 4512.16 Rs
$4512.16 \: rupees$