Mathematics 20 Online
OpenStudy (anonymous):

an oil distributes oil in the metal can shaped as an cylinder that has an actual radius of 5.1 cm and the height of 15.1 cm. a worker incorrectly measured the radius of 5 cm and the height of 15 cm determine the relative error in calculating the surface area to the nearest thousandth

OpenStudy (anonymous):

well first find the area (2pi*5.1) * (15.1) +(2pi*5.1^2) and subtract the are of (2pi*5) * (15) + 2(pi*5^2)

OpenStudy (saifoo.khan):

find the difference.

OpenStudy (anonymous):

it's 18.975 I think, it sort of matters if the can has a lid though. that's why I said to calculate for 2 times the area of the circle.

OpenStudy (anonymous):

the answer is 0.0029 but i wanna know how did they get the answer im very confused

A difference of 18.975 cm sq is correct when considering the lids. It would have to have a lid if the can is used to distribute the oil.

OpenStudy (anonymous):

oh, sorry it asks for relative error, so you have to take the number 18.975 and divide it by the total area

Would the total area be the area of the correct dimension?

OpenStudy (anonymous):

it should be, (which is about 647.294cm sq) but I got .0293... hmmmm....

maybe quanna copied answer incorrectly (like an extra 0)

I also wonder if Pi was used correct to a thousandth???

Anyway my calculations agree with jibblesmgee.

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