title: Calculate angle of triangle Python
body: <p>I'm trying to find out the angle of the triangle in the following, I know it should be 90 degrees, however I don't know how to actually calculate it in the following:</p>
  
  <p><img src="https://i.stack.imgur.com/GkevW.jpg" alt="enter image description here"></p>
  
  <p>Here's what I've tried:</p>
  
  <pre><code>angle = math.cos(7/9.899)
  angleToDegrees = math.degrees(angle)
  
  returns: 43.XX
  </code></pre>
  
  <p>What am I doing wrong?</p>