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ErinWeeks

  • one year ago

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

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  1. ErinWeeks
    • one year ago
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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 -_-

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

  3. ErinWeeks
    • one year ago
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    its 2.5 and 3.3

  4. JayDS
    • one year ago
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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

  5. ErinWeeks
    • one year ago
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    im still confused

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

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

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

  9. ErinWeeks
    • one year ago
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    okay thank you

  10. JayDS
    • one year ago
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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).

  11. ankolix
    • one year ago
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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

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

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

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

  15. JayDS
    • one year ago
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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)

  16. JayDS
    • one year ago
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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.

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

  18. JayDS
    • one year ago
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    add them together.

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

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

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

  22. JayDS
    • one year ago
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    it should be 128.25

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

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

  25. JayDS
    • one year ago
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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.

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

  27. ankolix
    • one year ago
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    yeah.. ivemistake

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

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

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

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

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

  33. JayDS
    • one year ago
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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.

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

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

  36. JayDS
    • one year ago
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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.

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