SOLUTION: PA is tangent from P to circle O. PO = 10 and AO = 6. Find PA.

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Question 438703: PA is tangent from P to circle O. PO = 10 and AO = 6. Find PA.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
%28PO%29%5E2+=+%28PA%29%5E2+%2B+%28AO%29%5E2
<==> 100+=+%28PA%29%5E2+%2B+36
<==> PA+=+sqrt%2864%29+=+8
Note that the radius vector is perpendicular to the tangent line PA, so we can use the Pythagorean theorem.