Points h and f lie on circle c. circle c is shown. line segments e c, f c, and d c are radii. tangents e g and d g intersect at point d outside of the circle. a line is drawn to connect points f and g. the length of g e is 12 and the length of e c is 9. angles e and d are right angles. what is the length of line segment gh? 3 units 4 units 5 units 6 units