Question

the outer curved surface of pencils having a diameter 7 mm and length 20cm coated with find material find the amount spent on coating 1000 packets of pencils each packet containing 10 pencils at the rate of ₹400 per sq m​

Answer 1

Answer:

Step-by-step explanation:

Diameter = 7mm = 0.7cm

Radius = 0.35cm

Length = 20cm

Pencil if a solid with a cylinder and a cone surmounted on it.

But as we need to find it's CSA,

CSA of pencil = CSA of cylinder

∴CSA of pencil = 2πrh

= 2*22/7*0.35*20

= 44*7/7

= 44cm²

1 packet = 10 pencils

1000packets = 10,000 pencils

W.K.T

44cm² = 0.004 m²

∴ The cost of coating the pencil is,

= 0.004 * 10,000

= ₹40

Therefore the cost is ₹40

Answer 2

Answer:

17600 rupees is the right answer.

Step-by-step explanation:

Mark it as BRAINLIEST answer