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anonymous

  • one year ago

MEDAL AND FAN Find the total area (in terms of K) of the prism. T.A. =

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  1. anonymous
    • one year ago
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    https://gmcprep.owschools.com/media/g_geo_ccss_2014/8/groupi67.gif

  2. anonymous
    • one year ago
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    @LynFran @mathstudent55

  3. triciaal
    • one year ago
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    area of a prism is the sum of the area of each of the 6 sides

  4. welshfella
    • one year ago
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    what does p = 20" refer too?

  5. anonymous
    • one year ago
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    @campbell_st

  6. anonymous
    • one year ago
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    i think its the perimeter

  7. triciaal
    • one year ago
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    oops this is not a regular prism. the area is still the sum of all the "faces' of the prism

  8. welshfella
    • one year ago
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    oh yes - OK

  9. triciaal
    • one year ago
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    |dw:1438285431890:dw|

  10. triciaal
    • one year ago
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    surface area = 2*area of pentagon face + perimeter of pentagon face* height

  11. welshfella
    • one year ago
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    area of the pentagon = 5 * area of each isosceles triangle with height k and base = p/5 = 20/5 = 4 = 5* k * 1/2 * 4

  12. welshfella
    • one year ago
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    and the area of each lateral is 6*4

  13. anonymous
    • one year ago
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    |dw:1438286011588:dw|

  14. welshfella
    • one year ago
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    yes thats the length of each side of the pentagon

  15. welshfella
    • one year ago
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    as tricial said you can find the area of all the lateral part by multiplying perimeter of pentagon by 6 = 20 * 6

  16. welshfella
    • one year ago
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    do't forget you have 2 pentagons

  17. anonymous
    • one year ago
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    whats the answer?

  18. anonymous
    • one year ago
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    @welshfella @triciaal

  19. welshfella
    • one year ago
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    the area is 2 * 5* k * 1/2 * 4 + 20* 6 all you need do is simplify

  20. anonymous
    • one year ago
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    240?? @welshfella

  21. welshfella
    • one year ago
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    you've forgotten to include the k

  22. welshfella
    • one year ago
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    240 is the lateral area only

  23. anonymous
    • one year ago
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    so 240*k?

  24. welshfella
    • one year ago
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    No you need to work out the first term 2 * 5 * k * 1/2 * 4 = ?

  25. welshfella
    • one year ago
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    if you prefer work out the numbers on your calculator then put k on the end

  26. anonymous
    • one year ago
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    like =k?

  27. welshfella
    • one year ago
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    this is the area of the 2 pentagons

  28. welshfella
    • one year ago
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    no like 235k but the number isn't 235

  29. anonymous
    • one year ago
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    the calculator says 0

  30. welshfella
    • one year ago
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    2*5*(1/2)*4 is not 0

  31. welshfella
    • one year ago
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    2*5 = 10 10 * 1/2 = 5 5 * 4 = ?

  32. anonymous
    • one year ago
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    20

  33. welshfella
    • one year ago
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    right so now it 20 * k + 240 = 20k + 240

  34. anonymous
    • one year ago
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    k=12??

  35. welshfella
    • one year ago
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    the question required TA in terms of k and there it is.

  36. anonymous
    • one year ago
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    are you sure?

  37. welshfella
    • one year ago
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    yes the answer is 20k + 240

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