abstract classes and interfaces

Design a new Triangle class that extends the abstract GeometricObject D class. (The source code for this abstract class can be found in chapters 9, 11, & 13 in Files). Write a test program that prompts the user to enter three sides of the triangle (make sure they define an actual triangle), a color, and a Boolean value to indicate whether the triangle is filled. The program should then create a Triangle object with these sides and set the color and filled properties using the input, in addition to circle and rectangle objects. The program should display, for each of these geometric objects, the area, perimeter, color, and true or false to indicate whether it is filled or not