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CAL 3; Easy Q

  1. Jan 23, 2005 #1
    Problem: Describe what 1<= x^2 + y^2 + z^2 <= 25
    looks like in 3-d

    Guess: A sphere with a radius between 1 & 25? Don't see how that's possible though...help
     
  2. jcsd
  3. Jan 23, 2005 #2

    dextercioby

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    Nope,it's the volume (the totality of points) comprised between 2 concentric spheres of radii 1 & 5 with centers at the origin of the coordinate system...

    Daniel.
     
  4. Jan 23, 2005 #3
    WOW! two spheres? Okay. So its the volume between their walls?
     
  5. Jan 23, 2005 #4

    dextercioby

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    EXACTLY.But spheres are closed surfaces...They don't have walls,because they're hollow...

    Daniel.
     
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