anonymous
  • anonymous
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.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
is that correct?
anonymous
  • anonymous
anonymous
  • anonymous

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anonymous
  • anonymous
Hello jhanny can you stay, many of you come and then leave...
Jhannybean
  • Jhannybean
The surface area of a hexagonal pyramid is defined by this funky formula \[A= \frac{3\sqrt{3}}{2}a^2+3a\sqrt{h^2+\frac{3a^2}{4}}\]
Jhannybean
  • Jhannybean
We can begin solving this by using the given information to find the height \(h\) of our hexagonal pyramid |dw:1438661575125:dw|
Jhannybean
  • Jhannybean
Using the pythagorean theorem for right triangles,... \[h=\sqrt{12^2-(7.5\sqrt{3})^2} =~?\]
Jhannybean
  • Jhannybean
anonymous
  • anonymous
Sorry, was I wrong? @Jhannybean
anonymous
  • anonymous
@Zale101 am i wrong?
Jhannybean
  • Jhannybean
Im looking for you to work out the problem with me and you yourself will see whether your answer is right or wrong :P
anonymous
  • anonymous
I just need to know, yes or no. I dont really have much time.
anonymous
  • anonymous
i literally only have a day left until I have to turn in a whole load of work so >.<
Jhannybean
  • Jhannybean
But now that you have the information to solve for h, we can find our "\(a\)" |dw:1438662349721:dw|
Jhannybean
  • Jhannybean
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 :)
Jhannybean
  • Jhannybean
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, \(a\)
Jhannybean
  • Jhannybean
And now that you have both \(h\) and \(a\), plug it into your funky formula and solve :)
anonymous
  • anonymous
...
anonymous
  • anonymous
so you are telling me I got it wrong then?
Jhannybean
  • Jhannybean
Nope.
anonymous
  • anonymous
...no offense but you are wasting my time.
Jhannybean
  • Jhannybean
Again, I'm not here to give you answers. That's against the code of conduct on openstudy. @ganeshie8
anonymous
  • anonymous
its NOT asnwers, its to see if i know it or not

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