Because if you a model your not going to get the right answer
Answer:
A. 
Step-by-step explanation:
Equation of a circle is
------------- (1)
Here

Radius is distance from center to circumference


Substituting values in equation (1)

Answer:
If the points cluster in a band from upper left to lower right, there is a negative correlation (if x increases, y decreases).
60 I believe I hope this helps if it was right :)
Circle geometry rule: Tangent to circle makes right angle with the radius
Please refer to the diagram below for the working out of each angle