Draw a circle of radius \(3 \ cm\). Take a point \(P\) on this circle and draw a tangent at \(P\).
 
 
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Answer variants:
\(TT'\) is the required tangent
Draw a circle with centre at \(O\) of radius \(3 \ cm\)
Take a point \(P\) on the circle. Join \(OP\)
Draw perpendicular line to \(OP\) which passes through \(P\)