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briana.img

  • one year ago

Help me find the height of this triangular prism?

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  1. briana.img
    • one year ago
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  2. welshfella
    • one year ago
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    surface area = area of 3 rectangles + area of the 2 triangles

  3. briana.img
    • one year ago
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    @welshfella sooo 48.735 = 3(15.12) + 2(???)

  4. welshfella
    • one year ago
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    yes

  5. briana.img
    • one year ago
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    @welshfella where do we go from therE?

  6. welshfella
    • one year ago
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    Find the area of a triangle then this = 0.5 * 2.7 * height of triangle solve for height

  7. briana.img
    • one year ago
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    @welshfella so confused on that part where did 0.5 come from?

  8. welshfella
    • one year ago
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    area of triangle = half * base*height

  9. welshfella
    • one year ago
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    - I don't like fractions - I always use decimals if possible

  10. briana.img
    • one year ago
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    @welshfella eeeerm i'm completely lost

  11. welshfella
    • one year ago
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    well work out the area of 2 triangles first 2* A = 48.735 - 3(15.12) = ?

  12. briana.img
    • one year ago
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    @welshfella why the 2*A= ????

  13. welshfella
    • one year ago
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    A = area of one triangle

  14. welshfella
    • one year ago
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    so 2A = 48.735-45.36 = 3.375 so the area of 1 triangle = 3.375 / 2 = 1.6875

  15. welshfella
    • one year ago
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    Now using the formula for the area of a triangle 1.6875 = 0.5 * 2.7 * h where h = height of the triangle ( = height of the prism) solve for h

  16. briana.img
    • one year ago
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    @welshfella 1.25???

  17. welshfella
    • one year ago
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    correct

  18. welshfella
    • one year ago
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    h = 1.6875 / (0.5*2.7) = 1.25

  19. welshfella
    • one year ago
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    gotta go - its very late here in the UK bye!

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