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ErinWeeks Group Title

Find the surface area of the figure to the nearest whole number. PLEASE HELPPPP

  • one year ago
  • one year ago

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  1. ErinWeeks Group Title
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    A. 310 ft2 B. 158 ft2 C. 135 ft2 D. 74 ft2 I thought it was C but it was wrong -_-

    • one year ago
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  2. ankolix Group Title
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    the back side in the image is very confusing :/

    • one year ago
  3. ErinWeeks Group Title
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    its 2.5 and 3.3

    • one year ago
  4. JayDS Group Title
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    hint: split it into two objects. find the surface area of the top triangle pyramid and add it to the surface area of the square prism

    • one year ago
  5. ErinWeeks Group Title
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    im still confused

    • one year ago
  6. JayDS Group Title
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    but you understand what I said?

    • one year ago
  7. ErinWeeks Group Title
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    i dont really -_-

    • one year ago
  8. JayDS Group Title
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    k wait, let me work through the whole thing first then I'll explain it to you.

    • one year ago
  9. ErinWeeks Group Title
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    okay thank you

    • one year ago
  10. JayDS Group Title
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    |dw:1357770316535:dw| see I split the two? this is what I meant and excuse my drawing. Note: we do not need to find the bottom base of the pyramid and top of the square prism, as it is not accounted towards the total surface area. (It's the part where they are glued together if you may).

    • one year ago
  11. ankolix Group Title
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    well i can to see 2 solids... the piramid and the cube.. so the piramid area is \[\frac{ 1 }{ 2 }* perimetre*face length\]. in your piramid \[\frac{ 1 }{ 2 } \times 18\times 3.3 \] and the cube surface

    • one year ago
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  12. ErinWeeks Group Title
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    for the second formula i got 29.7 ... i dont know how to do the 1st one

    • one year ago
  13. JayDS Group Title
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    yes 29.7 is right for the top(pyramid).

    • one year ago
  14. ErinWeeks Group Title
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    okay now can you explain how to do the bottom

    • one year ago
  15. JayDS Group Title
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    for the bottom(square prism) it is even easier. 2(4.5 x 6 + 4.5 x 6) + (4.5 x 4.5)

    • one year ago
  16. JayDS Group Title
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    this is because the top of the square prism(where it needs to be used to be stuck against the bottom part of the pyramid) is not accounted for.

    • one year ago
  17. ErinWeeks Group Title
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    i got 74.25 now what ??

    • one year ago
  18. JayDS Group Title
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    add them together.

    • one year ago
  19. JayDS Group Title
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    to get your final answer.

    • one year ago
  20. ErinWeeks Group Title
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    i got 103.95 but thats not a choice

    • one year ago
  21. JayDS Group Title
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    your 74.25 you got is wrong, try again.

    • one year ago
  22. JayDS Group Title
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    it should be 128.25

    • one year ago
  23. ankolix Group Title
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    no, it is \[4(4.5*6)+ 2(4.5*4.5)\]

    • one year ago
  24. ErinWeeks Group Title
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    with @ankolix formula i got 142.5

    • one year ago
  25. JayDS Group Title
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    @ankolix I don't think you understand the concept that you only need 4.5 x 4.5 once not twice.

    • one year ago
  26. ErinWeeks Group Title
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    @JayDS my answer and your answer are both not an option

    • one year ago
  27. ankolix Group Title
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    yeah.. ivemistake

    • one year ago
  28. JayDS Group Title
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    please tell me the options.

    • one year ago
  29. ErinWeeks Group Title
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    A. 310 ft2 B. 158 ft2 C. 135 ft2 D. 74 ft2

    • one year ago
  30. JayDS Group Title
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    and you made a calculation error before, so please be careful when entering it in the calculator.

    • one year ago
  31. ankolix Group Title
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    is 4(4.5*6)+(4.5*4.5)+29.7=157.95.. option B

    • one year ago
  32. JayDS Group Title
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    yep, option B.

    • one year ago
  33. JayDS Group Title
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    using my calculation you will get 157.95. and why is it not exact? because probably when they calculated they used more decimal places which resulted them to get a more accurate answer but we have been only given that, so we just those figures in the picture.

    • one year ago
  34. ankolix Group Title
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    medal for gratitude ;)

    • one year ago
  35. ErinWeeks Group Title
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    okay thank you so muchh..

    • one year ago
  36. JayDS Group Title
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    @ankolix, I would like to say you deserve the medal for trying but you have copied off me but good job.

    • one year ago
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