If the tangent at a point P to a circle with centre O cuts a line through O at Q such that PQ = 24 cm and OQ = 25 cm. Find the radius of the circle.
since QT is a tangent to the circle at T and OT is radius,
Therefore OT perpendicular QT
It is given that OQ=25 cm and QT= 24 cm
By Pythagoras theorem we have
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