Man what Ta FUHKK is this Bull Schitt

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

Is the point (0, 8) on the x-axis or y-axis? how do you know?