Answer:
24 degrees
Explanation:
The total of a triangle is 180 degrees and a right angle is 90 degrees ( you can tell it's a right angle if it forms the shape of a straight capital "L" or if it has the square in that corner).
So to simplify this , add 90 and 66 which equals 156.
Now we subtract 156 from 180 ----> 180 - 156 = 24
So 24 degrees is your answer.