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anonymous

  • one year ago

6.) Find the surface area of the regular pyramid shown to the nearest whole number. The figure is not drawn to scale. http://assets.openstudy.com/updates/attachments/55bff878e4b03325500374c7-lollygirl217-1438647128464-as.jpg my answer: 1,125 m^2. is that correct? 7.) What is the surface area of a conical grain storage tank that has a height of 37 meters and a diameter of 16 metes? Round the answer to the nearest square meter. my answer: 1152 square meters.

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  1. anonymous
    • one year ago
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    is that correct?

  2. anonymous
    • one year ago
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    @triciaal

  3. anonymous
    • one year ago
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    @Zale101 @Jhannybean

  4. anonymous
    • one year ago
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    Hello jhanny can you stay, many of you come and then leave...

  5. Jhannybean
    • one year ago
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    The surface area of a hexagonal pyramid is defined by this funky formula \[A= \frac{3\sqrt{3}}{2}a^2+3a\sqrt{h^2+\frac{3a^2}{4}}\]

  6. Jhannybean
    • one year ago
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    We can begin solving this by using the given information to find the height \(h\) of our hexagonal pyramid |dw:1438661575125:dw|

  7. Jhannybean
    • one year ago
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    Using the pythagorean theorem for right triangles,... \[h=\sqrt{12^2-(7.5\sqrt{3})^2} =~?\]

  8. Jhannybean
    • one year ago
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    @Lollygirl217 ?

  9. anonymous
    • one year ago
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    Sorry, was I wrong? @Jhannybean

  10. anonymous
    • one year ago
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    @Zale101 am i wrong?

  11. Jhannybean
    • one year ago
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    Im looking for you to work out the problem with me and you yourself will see whether your answer is right or wrong :P

  12. anonymous
    • one year ago
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    I just need to know, yes or no. I dont really have much time.

  13. anonymous
    • one year ago
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    i literally only have a day left until I have to turn in a whole load of work so >.<

  14. Jhannybean
    • one year ago
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    But now that you have the information to solve for h, we can find our "\(a\)" |dw:1438662349721:dw|

  15. Jhannybean
    • one year ago
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    Im sorry, Im helping you solve this to help you understand how to work the problem, I don't have the answer, but I can help you find it :)

  16. Jhannybean
    • one year ago
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    Now if we can find \(x\) using trig, then you can double it to find the base length \(a\) \[\tan(30) = \frac{x}{7.5\sqrt{3}} \rightarrow ~ x=7.5\sqrt{3}\tan(30)\]\[a=2x\] Therefore if you find x, just double it and you will have the base, \(a\)

  17. Jhannybean
    • one year ago
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    And now that you have both \(h\) and \(a\), plug it into your funky formula and solve :)

  18. anonymous
    • one year ago
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    ...

  19. anonymous
    • one year ago
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    so you are telling me I got it wrong then?

  20. Jhannybean
    • one year ago
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    Nope.

  21. anonymous
    • one year ago
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    ...no offense but you are wasting my time.

  22. Jhannybean
    • one year ago
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    Again, I'm not here to give you answers. That's against the code of conduct on openstudy. @ganeshie8

  23. anonymous
    • one year ago
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    its NOT asnwers, its to see if i know it or not

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