19. __C__ Segment QC is the radius (1/2 diameter)
20. __K__ Arc BDE is major because three points are listed
21. __E__ Segment AD is the diameter (length cutting the circle in half)
22. __L__ Arc ABD has two endpoints on the circle’s diameter
23. __H__ Angle AQB has an apex at the circle’s center, Q
24. __A__ Point Q is the circle’s center
25. __D__ Segment ED is a chord as it has endpoints on the circular arc
26. __B__ Point C is perpendicular to the radius (QC) where it meets the circle.
27. __F__ Segment AB is a secant because it contains a chord and intersects the circle at 2 points.
28. __J__ Arc EA is minor between two points
29. __G__ Segment CG is the tangent as it intersects the circle at one point, C.
Hope this helps!