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anonymous

  • 5 years ago

Someone please help with surface area of pyramids and cones

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  1. anonymous
    • 5 years ago
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    are these answers correct? the first one i got 282.6m^2 the second one i got 175.84in^2

  2. amistre64
    • 5 years ago
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    if you can cut the cone up its lengthand make into part of a circle, the surface area is easy to get :) maybe even easy if I think about it some

  3. amistre64
    • 5 years ago
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    is the 10 inches the length up the side of the cone or the height?

  4. anonymous
    • 5 years ago
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    length

  5. anonymous
    • 5 years ago
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    its actually slant height

  6. amistre64
    • 5 years ago
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    then that 10 inch length is the radius of a larger circle, find its circumference" 2pi10 20pi is its curcumference the small base circle is the length of the circumference that you want to find an area for 2pi4 = 8pi make sense?

  7. anonymous
    • 5 years ago
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    kinda

  8. anonymous
    • 5 years ago
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    \[s =\pi \times r ^{2}+\pi \times r \times l\] is the formula i need to use

  9. amistre64
    • 5 years ago
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    length of an arc = theta(r) 8pi = theta(10) theta = 8pi/10 = 4pi/5 area of sector = theta r^2/2 (4pi/5)(10)(10)/2 200/5 = 40pi fpr the surface area of the cone, do we include that base in this or not?

  10. amistre64
    • 5 years ago
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    40pi + 16pi = 56pi if I did it right :)

  11. anonymous
    • 5 years ago
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    ok

  12. anonymous
    • 5 years ago
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    would = 175.84in^2

  13. amistre64
    • 5 years ago
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    175.92 is what I get... is that close enough?

  14. amistre64
    • 5 years ago
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    175.84 if you use (3.14)

  15. anonymous
    • 5 years ago
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    yea

  16. anonymous
    • 5 years ago
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    how would i find the surface area of this one

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  17. amistre64
    • 5 years ago
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    if im doing it right, I get 85pi

  18. anonymous
    • 5 years ago
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    would i use half the diameter?

  19. amistre64
    • 5 years ago
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    if you dont have answers to check against, I would suggest gettting a second opinion :) but yes, radius is half the diameter

  20. anonymous
    • 5 years ago
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    \[s =\pi \times 5^{2}+\pi \times 5 \times 12\]

  21. amistre64
    • 5 years ago
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    i got 25pi + 60pi too :)

  22. amistre64
    • 5 years ago
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    im glad the formula works :)

  23. anonymous
    • 5 years ago
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    witch would = 266.9ft^2

  24. anonymous
    • 5 years ago
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    would you please help me with three more

  25. amistre64
    • 5 years ago
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    i could try.... getting kinda deer in the headlights feeling....must.....carry.........on. . . . . . . ok

  26. anonymous
    • 5 years ago
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    find the surface area of the regular pyramid

  27. amistre64
    • 5 years ago
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    #31 3cm is pointing to what?

  28. anonymous
    • 5 years ago
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    3cm is height i believe

  29. amistre64
    • 5 years ago
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    is it face height or pyramid height?

  30. anonymous
    • 5 years ago
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    the formula for this on is S=B+1/2Pl

  31. anonymous
    • 5 years ago
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    looks like pyramid hight

  32. amistre64
    • 5 years ago
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    pyramid height would have a dotted line stricking down the middle of it..... i think its face height.

  33. anonymous
    • 5 years ago
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    so do i

  34. amistre64
    • 5 years ago
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    4cm^2 + 12 cm^2 = 16 cm^2 for #31

  35. amistre64
    • 5 years ago
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    #32...all I see is a 7 and not much else for details...

  36. anonymous
    • 5 years ago
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    thats all there is

  37. amistre64
    • 5 years ago
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    is that all sides are 7? like an equalateral triangle?

  38. anonymous
    • 5 years ago
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    yea

  39. amistre64
    • 5 years ago
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    then I would do: 4 times (1/2)(49)sin(60) 84.87 m^2

  40. amistre64
    • 5 years ago
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    if you have a side-angle-side, the area can be determined by: (side)(side)(sin(angle))/2 and there are 4 sides so I timesed it by 4 :)

  41. amistre64
    • 5 years ago
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    (side)sin(a) = height, and the other side = base

  42. anonymous
    • 5 years ago
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    ok

  43. amistre64
    • 5 years ago
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    and for the last one its just like the first except with decimals..

  44. amistre64
    • 5 years ago
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    (9.2)^2 + 4(9.2)(13)/2

  45. amistre64
    • 5 years ago
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    84.64 + 239.2 = 323.84

  46. anonymous
    • 5 years ago
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    okay thank you so much

  47. amistre64
    • 5 years ago
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    youre welcome :)

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