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Sunshine447 Group Title

The figure below shows two similar right triangular prisms. What is the volume of Prism B rounded to the nearest hundredth cubic unit?

  • 2 years ago
  • 2 years ago

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    @phi

    • 2 years ago
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    @Agent_Sniffles @amistre64 @jim_thompson5910 @Hero

    • 2 years ago
  3. phi Group Title
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    two similar right triangular prisms. SIMILAR means that the ratio of their sides are the same number for example, look at the shortest side of the big prism and divide it by the length of the shortest side in the smaller prism what do you get?

    • 2 years ago
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    .56

    • 2 years ago
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    or 1.8... idk which

    • 2 years ago
  6. phi Group Title
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    I meant 9/6 = 3/2 or 1.5 now look at the other leg: the longer side of the big prism is 10.5 divide this by the corresponding side of the other prism what do you get?

    • 2 years ago
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    ohhh okay

    • 2 years ago
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    1.5

    • 2 years ago
  9. phi Group Title
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    now what do you think the (unknown) height (call it h) divided by 5 is ? h/5 = 1.5 (the same ratio) now find h

    • 2 years ago
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    7.5?

    • 2 years ago
  11. phi Group Title
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    yes. why the ? Is your calculator broken? But now you can find the volume of the big prism volume of Prism B is the area of its base (it's a triangle) times its height (just found to be 7.5) can you find the area of the base? then multiply by the height 7.5 to get the volume

    • 2 years ago
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    how do i find the area of the base?

    • 2 years ago
  13. phi Group Title
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    didn't you just do the area of a triangle in the last question?

    • 2 years ago
  14. Sunshine447 Group Title
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    is it b*h/2? My lesson isn't very clear on what's what....

    • 2 years ago
  15. phi Group Title
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    yes base times height divided by 2 base is one of the legs, the height (or altitude) is the line perpendicular to the base . The height makes a 90 angle with the base. In your picture, that little square in the corner of the 2 legs means 90 deg so your base and height are the 2 legs in the triangle.

    • 2 years ago
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    the base is 47.25 then. Right?

    • 2 years ago
  17. phi Group Title
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    Examples |dw:1349210955962:dw|

    • 2 years ago
  18. phi Group Title
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    base is 47.25 then. Right? I would say area of the base (of the prism) (there is also the base of the triangle, which is just 1 leg) Area of the base is 0.5*9*10.5= 47.25 now find the volume by multiplying that by the height of the prism

    • 2 years ago
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    didnt you just do that?

    • 2 years ago
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    or do i multiply 47.35*9?

    • 2 years ago
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    *47.25 sry typo

    • 2 years ago
  22. phi Group Title
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    don't lose track of what we are doing 1) we found the h using the idea of similar figures. h= 7.5 2) we found the area of the base of the prism A= 47.25 3) we find the volume by multiplying A*h

    • 2 years ago
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    354.375

    • 2 years ago
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    or 354.38 if we round up

    • 2 years ago
  25. phi Group Title
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    This question took a few steps, and you need to know a few facts...

    • 2 years ago
  26. Sunshine447 Group Title
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    ok

    • 2 years ago
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