Segment ED is a secant. Line BC
is tangent to circle A at point B,
where b = 10 and c = 5.
What is the value of a? Round
your answer to one decimal
place.
![Segment ED is a secant Line BC is tangent to circle A at point B where b 10 and c 5 What is the value of a Round your answer to one decimal place class=](https://us-static.z-dn.net/files/dd7/0b8daedf447e176c896dc6a299073327.png)