Help me I need the steps

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°?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Bring the fraction a/a-4 to a denominator of 16-a^2