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Find the length of radius in circle? (Pic provided)?
In the accompanying diagram, secants PAB and PCD are drawn to circle O. If PC=5, CD=7, and PA=4, find the length of a radius of circle O. Please show work.
2 Answers
- Anonymous8 years agoFavorite Answer
is PA = 4 ???
if it's then --->4(4+2r)=5(12) ---> r = ..
- 8 years ago
PA*AB=PC*CD according to Intersecting Secants Theorem
AB=2r (r is radius) PA=4-r PC=5 DC=7
(4-r)*2r=5*7 8r-2r^2=35 and you solve it to find the r .
Hope it helps :)
