Answer:
a = 40°
Explanation:
Since the total angle measurement is 90°, you can tell by the square indicator in the bottom right, you need to subtract 90 by 50. Doing to gives you 40. You can check by reversing this process. 50 + 40 = 90
40 degrees
90 degrees-50 degrees is equal to 90 degrees.
4.4m questions
5.7m answers