The length of QR is required.
The length of QR is 6.71 inches.
Geometry
From the figure it can be determined that
[tex]RP=NR=3\ \text{inches}[/tex] (Radius)
[tex]RP=NP=6\ \text{inches}[/tex] (MNPQ is a square)
From the Pythagoras theorem we get
[tex]QR=\sqrt{RP^2+QP^2}\\\Rightarrow QR=\sqrt{3^2+6^2}\\\Rightarrow QR=6.71\ \text{inches}[/tex]
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