1.

A circle has its centre at O. A tangent drawn from a point P, which is situated outside the circle, touches the circle at A. If PA = 4 cm and PO = 5 cm, then the length of the radius of the circle is

A. 1 cm.
B. 2 cm.
C. 3 cm.
D. 4 cm.
Answer» D. 4 cm.


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