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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

OpenStudy (radar):

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

OpenStudy (radar):

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....

OpenStudy (radar):

maybe quanna copied answer incorrectly (like an extra 0)

OpenStudy (radar):

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

OpenStudy (radar):

Anyway my calculations agree with jibblesmgee.

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