Answer:

Step-by-step explanation:
see the attached figure to better understand the problem
we know that
----> by angle addition postulate
substitute the given values

Answer:
sorry I dont know
Step-by-step explanation:
1/2 or 0.5
2/2 which is 1 - 1/2
I think the answer is a=2
The answer is 6.28318530718.
2 x pi (3.14159 etc.,) equals 6.28318530718...