From the diagram:
Two perpendicular lines, vertical line $AC$AC and horizontal line $CB$CB intersect at point $C$C, form a right angle as indicated by the small blue square. Line $AC$AC intersects the left endpoint of line $CB$CB. Both lines are marked with a single tick mark. A point $D$D is marked on a space above $CB$CB and to the right of $AC$AC. Segment $AB$AB is not explicitly drawn.
Is $C$C the midpoint of $\overline{AB}$AB?
Yes
No
Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.