11) The correct statement is line x and z are perpendicular lines
12) The correct statement is the distance from point C to line a is 8 cm not not 12 cm.
What are perpendicular lines?
11) Lines y and z are said to be parallel. This implies that lines y and z are always at equal distance from each other.
But from the diagram, line z is perpendicular to line x but no indication that line y also meet line x at right-angle. Therefore, lines x and y are actually vertical lines because they have the north and south orientation but may not be described parallel because no sign that indicates parallelism.
12) The distance from point C to AB is 12 cm, this implies that the perpendicular distance between line AB and point C is 12 cm. This not true. Rather the distance between point C and line AB is 8 cm that is while the distance between point C and point C is 12 cm.
The correct statement is that the distance between point C and line AB is 8 cm.