One link in a chain was made from a cylinder that has a radius of 2 cm and a height of 20 cm. How much plastic coating would be needed to coat the surface of the chain link? Use 3.14 for π.
251.2cm2
314 cm2
345.4 cm2
471 cm2

Question

One link in a chain was made from a cylinder that has a radius of 2 cm and a height of 20 cm. How much plastic coating would be needed to coat the surface of the chain link? Use 3.14 for π.
251.2cm2
 314 cm2
 345.4 cm2
 471 cm2

theyadoreshayyy · Answer

never mind i figured it out, its A

ItzAgar · Answer

Oh ok lol-

AZ · Answer

@theyadoreshayyy wrote:

never mind i figured it out, its A

That's correct because surface area of cylinder = $ 2\pi r h + 2\pi r^2$ however, this plastic coating only covers the round parts of the cylinder and not the bases, so we're only looking to calculate $ 2\pi r h$ (because the plastic coating is continuous and has to go on to cover the next link in the chain, so it cannot cover the the circular base the radius is 2 the height is 20 2 * pi * r * h 2 * 3.14 * 2 * 20 gets you the answer that you got :)