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September 21, 2014

September 21, 2014

Posted by **Anonymous** on Saturday, January 5, 2013 at 4:51am.

- maths -
**Steve**, Saturday, January 5, 2013 at 5:22amSince the tangent is perpendicular to the radius,

OPQ = 90-40=50

also, OQP=50

so, POQ=180-50-50=100

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