Answer:
The value of 
 is 11.077.
Step-by-step explanation:
The information of the statement is incomplete, given all these brief descriptions, we infer that this exercise is asking to find the value of 
 associated to internal angles of a triangle. 
From Geometry, we know that sum of internal angles equals 180º. Then, we construct the following expression:
 (1)
Lastly, we solve for 
:



The value of 
 is 11.077.