Lenght of a tangent segment drawn from a point which is at a distance between thier centres is 12 . What is the radius of each circle.
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In △PAO:
Applying pythagoras theorem
⇒PA² + AO² = PO²
⇒12² + r² = (12.5) ²
⇒r² = 156.25 - 144
⇒r² = 12.25
⇒ r = √12.25cm
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