The length of the tangent from a point \( \mathrm{Q} \) at a circle, of radius \( 6 \mathrm{~cm}...

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The length of the tangent from a point \( \mathrm{Q} \) at a circle, of radius \( 6 \mathrm{~cm} \) is \( 8 \mathrm{~cm} \). The distance of \( Q \) from the centre of the circle is
a. \( 10 \mathrm{~cm} \)
b. \( 8 \mathrm{~cm} \)
c. \( \sqrt{7} \mathrm{~cm} \)
d. \( 20 \mathrm{~cm} \)
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