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waheguru

  • 4 years ago

need some help im getting 311

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  1. GT
    • 4 years ago
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    ok

  2. jhonyy9
    • 4 years ago
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    ???

  3. karatechopper
    • 4 years ago
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    311?

  4. waheguru
    • 4 years ago
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    im posting the question sorry

  5. waheguru
    • 4 years ago
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    1 Attachment
  6. waheguru
    • 4 years ago
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    here we are

  7. meverett04
    • 4 years ago
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    Do you have the formula for the surface area of a cylinder?

  8. waheguru
    • 4 years ago
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    2pirsq plus 2pirh

  9. GT
    • 4 years ago
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    Surface area of fully cylinder = circumference * length. Here, you have half of it. So, 1/2*circumference*length = 1/2 * pi * 6 * 30 = 90 * pi

  10. jhonyy9
    • 4 years ago
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    a.

  11. GT
    • 4 years ago
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    waheguru - that is when including bottom and top circles. In this case, the roof has no such thing. So, you just need 1/2 circumference * length.

  12. asnaseer
    • 4 years ago
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    @GT is right

  13. waheguru
    • 4 years ago
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    oh so i included the bottom???

  14. GT
    • 4 years ago
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    Yeah. Don't.

  15. waheguru
    • 4 years ago
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    k so this is what i did 2 x pi x 3^2 + 2 x pi x 3 x 30 and divide by 2

  16. duha2011
    • 4 years ago
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    hi

  17. GT
    • 4 years ago
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    Remove 3*pi*r^2 and the rest is good.

  18. waheguru
    • 4 years ago
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    y

  19. jhonyy9
    • 4 years ago
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    a. is right sure

  20. GT
    • 4 years ago
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    Because the roof does not have a base and top (according to the problem description).

  21. asnaseer
    • 4 years ago
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    the question is asking for the area of the roofs curved surface - that does not include the two ends of the greenhouse

  22. waheguru
    • 4 years ago
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    so just the lateral

  23. GT
    • 4 years ago
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    yes.

  24. waheguru
    • 4 years ago
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    thx brozz

  25. asnaseer
    • 4 years ago
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    the curved surface of a cylinder has a surface area of \(2\pi rh\). in this case you have half a cylinder, so the surface area becomes \(\pi rh\)

  26. duha2011
    • 4 years ago
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    HI GUYS

  27. waheguru
    • 4 years ago
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    just practising for grade 9 EQAO

  28. asnaseer
    • 4 years ago
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    what is EQAO?

  29. waheguru
    • 4 years ago
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    evil questions attacking ontario lol im kidding its like an exam for grade 9 students

  30. asnaseer
    • 4 years ago
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    lol! :-D - good luck with them...

  31. waheguru
    • 4 years ago
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    thx

  32. jhonyy9
    • 4 years ago
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    is half perimeter of base multiply lenght=surface area

  33. jhonyy9
    • 4 years ago
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    this very easy

  34. asnaseer
    • 4 years ago
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    @jhonyy9 - things are always easy when you know how to do them - try and recall the days when you were also at the lower end of the learning curve :-)

  35. asnaseer
    • 4 years ago
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    like we ALL were

  36. jhonyy9
    • 4 years ago
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    yes right but this is the same like a rectangle curved on the base

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