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The length of a tangent from a point A at distance 5 cm from the centre of the circle is 4 cm. Find the radius of the circle,

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The length of a tangent from a point A at distance 5 cm from the centre of the circle is 4 cm. Find the radius of the circle.

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Let O be the centre and P be the point of contact.

Since tangent to a circle is perpendicular to the radius through the point of contact,

Hence, the radius of the circle is 3 cm.

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