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elisichi Group Title

Math question! Help please! Semester test tomorrowww!!

  • one year ago
  • one year ago

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  1. elisichi Group Title
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    There it is :(

    • one year ago
  2. elisichi Group Title
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    The answer for part B, the one I don't get is 3050, but I don't know how to get there.

    • one year ago
  3. mathstudent55 Group Title
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    |dw:1355067118226:dw|

    • one year ago
  4. InYourHead Group Title
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    Who told you the answer for B is 3050? That's not what I came up with.

    • one year ago
  5. InYourHead Group Title
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    Even though that's a REALLY big number, I realize I forgot to calculate the internal diameter. Hold on.

    • one year ago
  6. InYourHead Group Title
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    Okay. I think I've got the answer. Can you tell me how you started this problem?

    • one year ago
  7. elisichi Group Title
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    The textbook says that..

    • one year ago
  8. InYourHead Group Title
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    Textbook's wrong. Over THREE THOUSAND washers can be carved from one square meter of metal?

    • one year ago
  9. elisichi Group Title
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    Yes, so I did 3/0.0004= 7500 and thats the number of washers for question a

    • one year ago
  10. InYourHead Group Title
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    How did you get .0004?

    • one year ago
  11. elisichi Group Title
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    Oh my gosh, never mind I get it!!

    • one year ago
  12. InYourHead Group Title
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    What do you get?

    • one year ago
  13. InYourHead Group Title
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    You know the formula for the area of a circle is (3.14 * r^2) ? That's why I have no idea where you got the .0004

    • one year ago
  14. elisichi Group Title
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    So it is 3050 :)

    • one year ago
  15. InYourHead Group Title
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    What's 3050?

    • one year ago
  16. InYourHead Group Title
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    Here's what I did: I figured out the diameter of the entire washer. The washer's EXTERNAL DIAMETER is 2 cm. That means that the radius is 1 cm. And that means that the area is 3.14 cm squared, which is the same as .0314 meters squared.

    • one year ago
  17. InYourHead Group Title
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    I found the AREA of the entire washer, sorry. That's .0314 meters squared.

    • one year ago
  18. InYourHead Group Title
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    But the washer has a hole. So now we have to find the area of the hole. The DIAMETER of the hole (INTERNAL diameter) is 1 cm. That means that the AREA of the hole is.... (3.14 * .5 squared), which is .785 cm squared.

    • one year ago
  19. InYourHead Group Title
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    If you subtract that from 3.14 cm squared, you get 2.36 cm squared, which is the same as .0236 meters squared.

    • one year ago
  20. InYourHead Group Title
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    Can you tell me how you got .0004?

    • one year ago
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