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Mathematics 19 Online
OpenStudy (annabug):

help please

OpenStudy (annabug):

I think it might be 60 but not sure.

Directrix (directrix):

x = (1/2)( 172 - 52) according to the theorem: The angle formed by a tangent and a secant drawn to a circle from a point outside the circle is (1/2) the difference of the larger and smaller arcs cut off by the angle.

Directrix (directrix):

Yes, 60 is what I got. @annabug

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