Question

In the figure below, a tangent and a secant are drawn to a circle from exterior point E. Suppose that EC= 10.8 and EG= 18. Find CD. ​

Answer 1

Answer: 19.2

Explanation:

Using power of a point with respect to a circle:

EG²=EC*ED ==> ED=18²/10.8=30

CD=ED-EC=30-10.8=19.2