Question

In this diagram, like segment AD is tangent and line segment AC is secant. If AB = 6 and BC = 18, what is the length of line segment AD?

Answer 1

9514 1404 393

Answer:

12

Explanation:

The applicable relationship here is ...

AD² = AB·AC

AD = √(AB·(AB +BC)) = √(6·(6+18)) = √144

AD = 12