Answer:
11. = 132. 12. = 27. 13 = 59
Explanation:
For the first one it adds up to a straight angle, which is 180. So to get that we do 180 - 48 which is 132. For the second it adds up to a right angle, 90 - 43 is the equation you do. and for the last one, the two angles are congruent so you just subtract 90 - 31, like the last one