Investigation 3: A New Relationship & Investigation 4: Models With Undefined Behaviour
Step D
- Measure the angle between the x-axis and the diameter. 
 
  -  Draw a right triangle where the base represents the run, the height represents the rise, and the diameter represents the hypotenuse. 
 
  -  The slope will be 
 or the tangent  of the angle between the diameter and the base.