title: Plotting A Hyperboloid
body: <p>Teacher in class gave this formula </p>
  
  <pre><code>w = x**2 + y**2 - z**2
  </code></pre>
  
  <p>and showed its 3d graphic in class seen below. How do I plot this using Matplotlib (minus the intersecting plane)? I guess first a specific value for w needs to be selected, for example 10, otherwise 3d plotting would not be possible. Then should I convert to polar coordinates because of the z**2 in the formula? I tried this and failed. Any help would be appreciated. Also, does this shape have a name?</p>
  
  <p><img src="https://i.stack.imgur.com/CtH77.png" alt="enter image description here"></p>