It would be 20
21.3
-1.8
------
19.5 rounded would be 20
Step-by-step explanation:
EF is a segment so it's a line with the end points as E and F. Line RS bisects(cuts in half) line EF. Then where the two lines meet is where A is.
Hope this helped.
If I understand it correctly then its complementary angle will be 115˚, because 180-65=115.