Circle O has radius 5. Segment $\overline{AS}$ has length $5$ and is tangent to circle $O$ at $A$. If $P$ is the projection of A onto OS, find length PS.
Find length PS.
PS is half the base of an equilateral triangle OSA with side length 5.
\(\color{blue}\overline{PS}=2.5\)
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+178 
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