Points, Lines, Triangles, and Quadrangles

• Download and add DrawingBoard.jar to the BlueJ library. This jar file contains a package named DrawingBoard, which contains a class named DrawingBoard. DrawingBoard objects contain a method with the following signature: public void draw (LineTypeObject ), which can be used to draw line-like objects on the screen.
• Download and extract the files in PointLine.zip into a new BlueJ project.
• Complete the definitions for the classes Line, Triangle, and Quadrangle.

Solutions: Line.java, Triangle.java, TestDB.java