Question

The radius of a cylindrical tank of oil without cap is 1.40 m and height is 2.3 m. What will be the cost of painting this tank from outside at the rate of Rs.160 per m?

Answer 1

hiii!!!

here's ur answer...

given :-

radius of the cylindrical tank = 1.40m

height of the cylindrical tank = 2.3m

ATQ, the cylindrical tank is without cap so we will us CSA + 1base formula

CSA + 1 base of the cylindrical tank = 2πrh + πr²

= ( 2 × 22/7 × 1.4 × 2.3 ) + ( 22/7 × 1.4 × 1.4 )

= ( 44 × 0.2 × 2.3 ) + ( 22 × 0.2 × 1.4 )

= 20.24 + 6.16

= 26.4m²

therefore cost of painting the tank at the rate of rs 160 per m² = 26.4 × 160 = rs 4224

hope this helps..!!