Help please no one helps me

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 many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

Write the slope intercept equation for line ab.