What additional information is needed to prove the triangles are congruent by the sas prostulate

Solve the system of equations. y= 2x y= x^2 - 15

For the equations below which statement is true ?

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°?