Question

A cylindrical oil tank has diameter 7 m and height 9 m. If the inner side of the tank has to be painted all over,what will it cost at rupees 35 per square metre?​

Answer 1

$\rm\bf\underline{Question:}$

A cylindrical oil tank has diameter 7 m and height 9 m. If the inner side of the tank has to be painted all over,what will it cost at rupees 35 per square metre?

$\rm\bf\underline{Answer:}$

$TSA \: \: of \: \: \: cylinder = 2πr(h+r)$

                       

$= 2 x 22/ 7 \times 7/2 (9 +3.5)$

                       

$=22 \times 12.5$

                   

$= 275 m²$

$cost = 275 \times 35 = rs \: \: 9625$

Answer 2

$\Large \tt \pink {answer}$

= 2πr(h+r)TSA of cylinder=2πr(h+r)

=2x22/7×7/2(9+3.5)

=22×12.5

=275m²

cost=275×35 =rs962