can someone check this please? thanks in advance.
Check what, exactly.?
Others may approach checking work differently, but in my own case, I ask that you share with me the actual work you've done. Then I'd be happy to give you feedback on it.
https://www.google.com/search?q=surface+area+of+a+cylinder&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb#channel=sb&q=surface+area+of+a+cylinder&rls=org.mozilla:en-US:official This may help too. Google has its own surface area calculator. This can be used for checking your work too (they don't give explanations, just the answer. This can help you see if your answer matches the computer's answer.) If you find a difference between the two answers, someone on OpenStudy can help figure out where it went wrong.
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