Could someone please help me Thank you!!

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°?

How do you solving the solution of each system using elimination?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?