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anonymous

  • 5 years ago

Please help. i thought i understood this but i don't.. find the surface area of these prisms

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  1. anonymous
    • 5 years ago
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  2. anonymous
    • 5 years ago
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    using this formula 2B=Ph

  3. anonymous
    • 5 years ago
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    2B+Ph

  4. amistre64
    • 5 years ago
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    surface area is just the area of each side added together.

  5. amistre64
    • 5 years ago
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    #32 = 2wl + 2wh + 2 lw

  6. amistre64
    • 5 years ago
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    l=7; w=8; and h=12

  7. anonymous
    • 5 years ago
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    so 2*8*7+2*8*12+2*7*8?

  8. amistre64
    • 5 years ago
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    or 2(base area) + (base perimeter)(height) would work

  9. amistre64
    • 5 years ago
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    2(7)(8) + 2(7)(12) + 2(8)(12)...yeah

  10. anonymous
    • 5 years ago
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    so 472ft sq

  11. amistre64
    • 5 years ago
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    472 is surface are for #32

  12. amistre64
    • 5 years ago
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    the top and bottom are closed in right?

  13. anonymous
    • 5 years ago
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    ya

  14. amistre64
    • 5 years ago
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    #37 is the same reasoning 2(8)(5) + 2(8)(12) + 2(5)(12)

  15. amistre64
    • 5 years ago
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    392 = surface area for #37

  16. amistre64
    • 5 years ago
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    #33 is an equal sided triangle with sides = to 5; it length is equal to 8

  17. amistre64
    • 5 years ago
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    3(5)(8) equals the surface are for the long sides

  18. amistre64
    • 5 years ago
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    the surface are for 2 triangle faces is: (5)(5)sin(60)

  19. amistre64
    • 5 years ago
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    21.65 + 120 = 141.65

  20. anonymous
    • 5 years ago
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    ok thank you

  21. amistre64
    • 5 years ago
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    finding the triangle face area by just the sides is tricky...but if you know the formula for the area of a triangle with 2 sides and an angle inbetween them, its easier :)

  22. anonymous
    • 5 years ago
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    ok

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spraguer (Moderator)
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