Respuesta :

WhEnYoUAtEyoUrEdOg
Assuming that is a complementary angle meaning that the angle will add up to 90' your answer should be:

78 <-----
this is actually really easy. 

so, it is a right triangle, with one angle 90 degrees, so the other 2 angles combined can only equal 90.

we already know that one angle is 12, so just subtract 12 from 90 and you get your answer.

so    - 90
          12
          ----



Solve this equation, and you get your answer (:

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