title: Computing surface area of a spherical patch
body: <p>By using <code>surf2patch(sphere(),'triangle')</code>, the spherical coordinates of sphere are converted into triangular patches.</p>
  
  <p>Is there any way of calculating the surface area of each one of these patches?</p>
  
  <p>I can iterate through each patch, and obtain the cartesian coordinates of each of the vertices that form the patch, but not sure about the math part.</p>
  
  <p>Thanks</p>