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Thread: Math problems

  1. #11
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    Quote Originally Posted by invictus View Post
    If I recall correctly than the radius is 4 feet times squared times pi which is 3.14 (I had to look up pi)... Which comes out to 2009.6 square feet...

    Okay, so what did I get wrong and where?
    Yes, the radius is 4 feet. And pi is approximately 3.14. But I'm not sure where you got 2009.6 square feet, so I couldn't tell you where you went wrong except to say the answer is incorrect.
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    Quote Originally Posted by invictus View Post
    Simpler than your problem but...

    Two cars start at the same point and drive in the opposite direction. They drive 8 miles each and then both make a right turn and drive 6 miles each. How far apart are they?
    20 miles.
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    Okay, so I think you calculated the volume of the cylinder, not its surface area.
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    Quote Originally Posted by Ethereal View Post
    Yes, the radius is 4 feet. And pi is approximately 3.14. But I'm not sure where you got 2009.6 square feet, so I couldn't tell you where you went wrong except to say the answer is incorrect.
    No, I see where I went wrong.. I found the total area of the circle as oppose to the perimeter. Which is 24.42 times 40...

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    carolina73's Avatar Senior Member
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    No matter how you look at it a cylinder does not care what kind of caps you put on it. Its just pi * D * L or 3.14 * 8 * 40

    This assumes no corrections for the thickness of the wall since a flat piece of metal will not join with the two ends exactly parallel. You learn this when you make thick wall pipe or steel rings.

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    Quote Originally Posted by carolina73 View Post
    No matter how you look at it a cylinder does not care what kind of caps you put on it. Its just pi * D * L or 3.14 * 8 * 40

    This assumes no corrections for the thickness of the wall since a flat piece of metal will not join with the two ends exactly parallel. You learn this when you make thick wall pipe or steel rings.
    Correct.
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    8 x π = 25.13274 x 40 = 1,005.31
    "The difference between what we do and what we are capable of doing would suffice to solve most of the world’s problems.”
    Mahatma Gandhi

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    Quote Originally Posted by Dr. Who View Post
    8 x π = 25.13274 x 40 = 1,005.31
    Yeah, should have used a calculator... Somehow I ended up multiplying 8x3.14 and coming up with 24.42... Made a mistake in my head multiplying .14 by three as oppose to etght...

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    Quote Originally Posted by invictus View Post
    Simpler than your problem but...

    Two cars start at the same point and drive in the opposite direction. They drive 8 miles each and then both make a right turn and drive 6 miles each. How far apart are they?
    20 miles Simple right angle problem A squared + B squared = B squared. I don't know how to do superscript with this text box.

    256 x 144 = 400. Sqrt of 400 = 20

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    Quote Originally Posted by invictus View Post
    Yeah, should have used a calculator... Somehow I ended up multiplying 8x3.14 and coming up with 24.42... Made a mistake in my head multiplying .14 by three as oppose to etght...
    Your mistake was calculating the volume of the cylinder instead of its surface area.
    Power always thinks it has a great soul, and vast views, beyond the comprehension of the weak. And that it is doing God's service when it is violating all His laws.
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