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15. Find the required length

Answer variants:

17

$5$

$5 \sqrt{2}$

$QR$ and

$SR$ are two tangents from the point

$R$ . If

$\angle QRP$

$=$

$45 °$ and

$PR$

$=$

$5 \sqrt{2}$

$cm$ , then find the length of

$PQ$ .

Answer:

The length of

$PQ$

$=$

$cm$

$1$

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