A secant PAB is drawn from an external point P to the circle with centre O, intersecting it at A and B. If OP = 17 cm, PA = 8 cm and PB = 21 cm, then the radius of the circle is:

A secant PAB is drawn from an external point P to the circle with cent

1.	A secant PAB is drawn from an external point P to the circle with centre O, intersecting it at A and B. If OP = 17 cm, PA = 8 cm and PB = 21 cm, then the radius of the circle is:
A.	10 cm
B.	12 cm
C.	11 cm
D.	15 cm
Answer» D. 15 cm

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A secant PAB is drawn from an external point P to the circle with centre O, intersecting it at A and B. If OP = 17 cm, PA = 8 cm and PB = 21 cm, then the radius of the circle is:

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