If you know only $a, R, $ and $\theta$, can you find $d$? If so, how? Please explain!
I ran across this problem (not literally) while trying to solve another post on Math Exchange and after scratching my head for a few minutes, I decided to see if anyone else might know.
NOTE: It is not a duplicate. This is a small part of the other problem that I found unsolvable. Even a few Google searches yielded naught!
HINT
By the law of sines
$$\frac{\sin \theta}R=\frac{\sin \alpha}{R+a}$$
from which we can find $\alpha$.