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Math Help - Can someone help with volume and surface areas?

  1. #1
    Newbie DexterDawg's Avatar
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    Exclamation Can someone help with volume and surface areas?

    Hi,
    I'm new here and am looking for some help.
    I'm trying to find the volume and surface area of a triangular prism.
    The triangle is 1.25m wide and 1.7m high
    The rectangle is 2m wide and 1.81 m high.
    Does anyone know the formulas I have to use?
    I have the answer here, I'm just not sure how to do the working.

    Thanks.
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  2. #2
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    e^(i*pi)'s Avatar
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    West Midlands, England
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    Quote Originally Posted by DexterDawg View Post
    Hi,
    I'm new here and am looking for some help.
    I'm trying to find the volume and surface area of a triangular prism.
    The triangle is 1.25m wide and 1.7m high
    The rectangle is 2m wide and 1.81 m high.
    Does anyone know the formulas I have to use?
    I have the answer here, I'm just not sure how to do the working.

    Thanks.
    The triangle and a rectangle? I don't get what you mean.

    A prism is defined as having the same cross sectional area along it's entire length.

    In general: V = A_{c}l where A_c is cross sectional area and l is length

    For a triangular prism A_c = \frac{1}{2}bh

    V_{\text{ triangular prism}} = \frac{1}{2}bhl
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  3. #3
    Newbie DexterDawg's Avatar
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    Arrow

    I don 't get what I mean either....
    The answers are in the back of my book and the volume should be 2.125m3 and the surface area is 9.37m2.
    If anyone can work this out, please let me know what I'm talking about
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