知识点：Parallel and vertical
In the parallel part, just click on the rectangle with the same height. In the vertical part, just click on the point which can make the line between the two points vertical with the existing line. In the to draw part, just click the two points to make the new line parallel or vertical with the existing line.
This game is designed for four grade pupils to get a full understanding about line, including its formation, their relationship such as parallel, vertical. Games of QD Learn are developed specifically for primary school students, both educative and entertaining. All the QD Learn games are designed according to educational theory. Each game is designed for each knowledge point. QD Learn aims to teach through lively activities and happy learning.