254 how you do this is 9/120 which equals .075 and then 19.05/.075 which equals 254
Definition of an exterior angle
At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle. See picture below.
Calculating the Angles
We can use equations to represent the measures of the angles described above. One equation might tell us the sum of the angles of the triangle. For example,
x + y + z = 180
Use a protractor. Place the whole on the dot of the angle and you should know how to do the rest.
You will have to go step by step
