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In the first picture below, the line joi...

In the first picture below, the line joining: two points on a circle is extended by 4 centimetres and a tangent is drawn from this point. Its length is 6 centimetres, as shown:
'(##VPU_TTT_MAT_X_P02_C07_E06_005_Q01##)'
The second picture, shows the same line extended by 1 centimetre more and a tangent drawn.from this point. What is the length of this tangent?

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