I have this circle, and I want to find the lengths of the two green lines. Heres the situation:

How do I calculate that?
I have this circle, and I want to find the lengths of the two green lines. Heres the situation:

How do I calculate that?
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the vertical line's length is $1\times \sin 30$ and the horizontal line's length is $1\times \cos 30$ (in degrees).