On a circle of radius 7 units, PQ and QR are chords of length 7 units each. What is the length of the chord PR in units?

1
\(\frac{28}{\sqrt{3}}\)
2
\(\frac{7}{\sqrt{3}}\)
3
\(\frac{14}{\sqrt{3}}\)
4
\(\frac{21}{\sqrt{3}}\)

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