Both are vertical angles (opposite)
So, they are congruent ( equal)
6a +11 = 2a+83
Solve for a:
6a -2a = 83-11
4a= 72
a= 72/4
a= 18
Value of the angles:
6a+11 = 6(18)+11 = 108+11 = 119°
2a+83 = 2(18)+83 =
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