Description: The interface OnSquare {float getArea () class Triangle (triangle) requirements (area)} class Circle (Park) Class Square (square), console input, Circle, 10 area = r* r* Input: 2: square , 10 20 area = a* b input, Triangle 10, 20 Area = a* b/2 input 4 Exit. And print the results. Area and shape (shape).
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interface\Circle.java
.........\Handle.java
.........\Shape.java
.........\Square.java
.........\Test.java
.........\Triangle.java
interface
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