Secant and Tangent #!#Important Theorem

In the following figure, PR is a secant and PT is a tangent to the circle. If PT=6cm and QR=5cm , then PQ= _______cm.

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In the given figure XYZ is a secant and ZT is a tangent. What is the value of x.

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In the given figure XYZ is a secant and ZT is a tangent. What is the value of x. दिए गए आकृति में XYZ एक छेदक रेखा है और ZT एक स्पर्शरेखा है। x का मान ज्ञात कीजिए।