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anonymous

  • 5 years ago

it gives me a right triangle prism, i guess, the height is 6.4 the base is 2 and the line at the top of the hypotenuse is 2.9. find the surface area

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  1. anonymous
    • 5 years ago
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    I'm going to send a pic. Tell me if this is what you have.

  2. anonymous
    • 5 years ago
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    ok

  3. anonymous
    • 5 years ago
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  4. anonymous
    • 5 years ago
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    6.4, not 6...sorry

  5. anonymous
    • 5 years ago
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    how do you draw something

  6. anonymous
    • 5 years ago
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    I just go into 'paint' in windows, then save it on the desktop, then click 'attach file' below, attach and post.

  7. anonymous
    • 5 years ago
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    If it's what I think it is, it isn't 'hard', just finicky.

  8. anonymous
    • 5 years ago
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    It comes down to the same principle we used to solve the last problem. You have faces that are shapes you already know the area of. You just break the surface area down into those shapes. Are you drawing something?

  9. anonymous
    • 5 years ago
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    yes

  10. anonymous
    • 5 years ago
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    1 Attachment
  11. anonymous
    • 5 years ago
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    nothing shows up

  12. anonymous
    • 5 years ago
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    Ah, okay, yes, something did come through - I just had to magnify your atom of a picture, lol!

  13. anonymous
    • 5 years ago
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    how do u magnify and it was pretty big when i made it

  14. anonymous
    • 5 years ago
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    I'm thinking the hardest part for you is the triangular face?

  15. anonymous
    • 5 years ago
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    I use Google Chrome, and it opens in a new page with a little magnifying icon.

  16. anonymous
    • 5 years ago
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    Let's do the triangle faces first.

  17. anonymous
    • 5 years ago
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    where is it at when u clicked it in the center

  18. anonymous
    • 5 years ago
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    and ok

  19. anonymous
    • 5 years ago
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    You have two right-angled triangles. These have a height of 6.4 and base 2. The area of any triangle is \[\frac{1}{2}(base)(perpendicular.height)\]Luckily, perpendicular height is the height of a right-angled triangle. So your area is\[\frac{1}{2} \times 2 \times 6.4=6.4\]You have two of these, one on the top, one on the bottom.

  20. anonymous
    • 5 years ago
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    So the area of the triangular faces is 2 x 6.4 = 12.8. Put this aside and tackle the faces on the side.

  21. anonymous
    • 5 years ago
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    These are just rectangles. Each has dimensions 6.4 x 2.9 = 18.56. Again, you have two of these, so your area for the side-on rectangular faces is 2 x 18.56 = 37.12.

  22. anonymous
    • 5 years ago
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    Now all you gave left is the base. It is rectangular and has dimensions, 2 x 2.9 = 5.8. Can you see how the side length of the base is the same as the length of the prism at the top (where you've written 2.9)?

  23. anonymous
    • 5 years ago
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    yea

  24. anonymous
    • 5 years ago
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    then just add them all up?

  25. anonymous
    • 5 years ago
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    The total area is just the sum of these separate areas:\[12.8 + 18.56+5.8=37.16\]square units.

  26. anonymous
    • 5 years ago
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    You got it.

  27. anonymous
    • 5 years ago
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    youre freakin smart man

  28. anonymous
    • 5 years ago
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    You picked it up, so you're doing alright too ;)

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