Answer:
ti guarantee it is 45 degree
Step-by-step explanation:
first the opposite angle of 39 will be 39
then 39 plus 42 is 81. a triangle is 180 so the third angle is 99.
so since supplementary angles also equal to 180 the other side is 81.
same with 126 the other side is 54.
now the triangle where x is we have found 2 angles 81 and 54 so the last one will be... drumroll... 45 since a triangle equals tk 180 degree.
