X =

-1-

-2-

 360 - (90 + 40 + 15) = 215

X = 360 - 215 = 145

---------

45

----------------------

180-85=95

R+B=95

(R+B)/2=47.5

X=180-47.5

X=132.5°

----------------

6

-3-

-4-