Page 1 of 3 123 LastLast
Results 1 to 15 of 39

Math Help - find each side of a cube - volume.

  1. #1
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897

    find each side of a cube - volume.

    hi, in need to work out this question but im having some problems:
    The volume of a cube = 196cm^3
    Find each side.


    im not sure how to work this out, i know to get the volum of a cube you need to times length by width by height.

    if anyone can help could you please post!

    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    Well, what do you know about cubes? What's the definition of a cube?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    i know a cube has 6 sides
    Follow Math Help Forum on Facebook and Google+

  4. #4
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    You know more than that. A rectangular prism has six sides, but is not necessarily a cube. What's special about a cube?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    ?? i don't know.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    From the wiki on cubes:

    In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex.
    Now, what kind of faces does the cube have?
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    6 faces with three meeting at each vertex.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    That's correct, but not all. What else do you know about the faces?
    Follow Math Help Forum on Facebook and Google+

  9. #9
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    they are bounded.
    Follow Math Help Forum on Facebook and Google+

  10. #10
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    Well, the object is bounded, that's true. But in the definition above, I want you to take a close look at every single word that has anything whatsoever to do with the faces of the cube. What shape are they?
    Follow Math Help Forum on Facebook and Google+

  11. #11
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    "6 square faces"
    Follow Math Help Forum on Facebook and Google+

  12. #12
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    Ah. There you go. And the sides of a square are ... what?
    Follow Math Help Forum on Facebook and Google+

  13. #13
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    equal
    Follow Math Help Forum on Facebook and Google+

  14. #14
    A Plied Mathematician
    Joined
    Jun 2010
    From
    CT, USA
    Posts
    6,318
    Thanks
    5
    Awards
    2
    So what does that tell you about all the sides of the cube?
    Follow Math Help Forum on Facebook and Google+

  15. #15
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    all the sides of the cube must be equal
    Follow Math Help Forum on Facebook and Google+

Page 1 of 3 123 LastLast

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: September 30th 2010, 12:34 PM
  2. how to find maximum volume of cube inside cone
    Posted in the Calculus Forum
    Replies: 8
    Last Post: June 14th 2009, 12:07 AM
  3. flux through each side of cube
    Posted in the Calculus Forum
    Replies: 13
    Last Post: April 23rd 2009, 10:03 PM
  4. Replies: 0
    Last Post: October 15th 2008, 05:05 AM
  5. Replies: 2
    Last Post: March 30th 2008, 02:54 PM

Search Tags


/mathhelpforum @mathhelpforum