Question

A point P is 25 cm away from the center of a circle and the length of tangent drawn from P to the circle is 24 cm. Find the radius of the circle. 

Answer 1

Draw a circle and let P be a point such that OP = 25cm. 

Let TP be the tangent, so that TP = 24cm 

Join OT where OT is radius.

Now, tangent drawn from an external point is perpendicular to the radius at the point of contact.