PT is a tangent to the circle with centre C. Given CP= 20cm and PT=16 cm, find the radius of the circle.
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PT=16cm
CP=20cm
angle CTP=90(radius is to the tanged)
By Pythagoras theorem
(PC)^2=((PT)^2+(CT)
(CT(^2=114
CT=√144
CT=12 cm
radius of circle=12cm
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