Answer:
x=61 -> Figure A
x=27 -> Figure B
x=12 -> Figure C
Explanation:
For A:
x=61 because the line going through the shape cuts in angle into 2 congruent angles
For B:
The corner adds up to 90 because it a rectangle, and rectangles only have right angles.
So: 2x+10+x-1=90
Solve.
3x+9=90
3x=81
x=27
For C:
The two given angles should add up to 90.
4x+10+2x+8=90
Solve.
6x+18=90
6x=72
x=12