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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 = 12 cm and PB = 22.5 cm, then the radius of the circle is:
5Q:
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 = 12 cm and PB = 22.5 cm, then the radius of the circle is:
- 1$$ 2\sqrt {3} \ $$ cmfalse
- 2$$ \sqrt {19} \ $$ cmtrue
- 3$$ \sqrt {17} \ $$ cmfalse
- 4$$ 3\sqrt {3} \ $$ cmfalse
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