Question

a closed metallic cylinder has its base diameter 56 cm and it is 2.72 m high.Find the cost of the metal used to make it,if the metal cost RS. 80 per square metre​

Answer 1

Answer:

Hey

Here you go!

Diameter = 56 cm  

Radius = 56/2 = 28 cm

Height = 2.72 m = 272 cm

Total surface area of cylinder = 2πrh + 2πr²

= (2*22*28*272)/7 + (2*22*28*28)/7

= (176*272) + (176*28)

= 47872 + 4928

= 52800 cm²

1 sq m = 10000 sq cm

Area in sq m = 52800/10000

= 5.28 sq m

Cost of metal = Rs. 80 per sq m

Total cost = 80*5.28

= Rs. 422.40