Any point P with coordinates (\(x, y\)) on the circumference of a circle can be joined to the centre (0, 0) by a straight line that forms the hypotenuse of a right angle triangle with sides of length ...
A tangent meets a circle at one point and one point only. The angle between a tangent and a radius is a right angle of \(90^\circ\). PT is a tangent and CT is a radius, therefore \(\angle CTP=90^\circ ...
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