Answer:
See explaination 
Explanation:
The GeometricObject
public class GeometricObject {
 private String color = " white ";
 private boolean filled;
 private java.util.Date dateCreated;
 public GeometricObject() {
 dateCreated = new java.util.Date();
 }
 public GeometricObject(String color, boolean filled) {
 dateCreated = new java.util.Date();
 this.color = color;
 this.filled = filled; 
 }
 public String getColor() {
 return color;
 }
 public void setColor(String color) {
 this.color = color;
 }
 public boolean isFilled() {
 return filled;
 }
 public void setFilled(boolean filled) {
 this.filled = filled;
 }
 public java.util.Date getDateCreated() {
 return dateCreated;
 }
 public String toString() {
 return "Created on " + dateCreated + "\n color: " + color + " and filled "; 
 } 
 }
The Triangle program
public class Triangle extends GeometricObject {
 private double side1 = 1.0;
 private double side2 = 1.0;
 private double side3 = 1.0;
 public Triangle() {
 }
 public Triangle(double side1, double side2, double side3) {
 this.side1 = side1;
 this.side2 = side2;
 this.side3 = side3;
 }
 public double setSide1() {
 return side1;
 }
 public double setSide2() {
 return side2;
 }
 public double setSide3() {
 return side3;
 }
 public void setSide1(double side1) {
 this.side1 = side1;
 }
 public void setSide2(double side2) {
 this.side2 = side2;
 }
 public void setSide3(double side3) {
 this.side3 = side2;
 }
 public double getArea() {
 return (side1 + side2 + side3) / 2;
 }
 public double getPerimeter() {
 return side1 + side2 + side3;
 }
 public String toString() {
 return " Triangle: Side 1 = " + side1 + " Side 2 = " + side2
 + " Side 3 = " + side3;
 }
}
The Testprogram.
import java.util.Scanner;
public class TestTriangle {
 private double side1 = 1.0;
 private double side2 = 1.0;
 private double side3 = 1.0;
 public static void main(String[] args) {
 Scanner input = new Scanner(System.in);
 System.out.println("Enter three sides of the Triangle");
 double side1 = input.nextDouble();
 double side2 = input.nextDouble();
 double side3 = input.nextDouble();
 System.out.println("Enter the color of the Triangle");
 String color = input.next();
 System.out.println(" Is the Triangle filled? Reply with 'True' or 'False' ");
 String filled = input.next(); 
 }
 {
 new Triangle(side1, side2, side3);
 //How do i get the information into theTriangle?
 System.out.println("The Triangle Sides are \n side 1: " + side1 + "\n Side 2: " + side2 + "\n Side 3: " + side3);
 System.out.println("The Triangle's Area is " + (side1 + side2 + side3) / 2);
 System.out.println("The Triangle's Perimeter is "
 + (side1 + side2 + side3));
 System.out.println("The Triangle's Color is " + //what goes here?);
 System.out.println("Is the Triangle filled? " + //what goes here?);
 }
}
You need to create a new Triangle object like this, so that you have a reference
Trangle triangle = new Triangle(side1, side2, side3);
 // ^^^^^^ This is the most important thing you're missing. You need a reference
 // point for your object. That's the only way you can access it's
 // properties. 
You also need to set it's filled and color properties
triangle.setFilled(filled);
triangle.setColor(color);
Then, you can invoke its methods like this:
System.out.println("The Triangle Sides are \n side 1: " 
 + triangle.getSide1() + "\n Side 2: " + triangle.getSide2() 
 + "\n Side 3: " + triangle.getSide3());
System.out.println("The Triangle's Area is " + triangle.getArea());
System.out.println("The Triangle's Perimeter is " + triangle.getPerimeter();
System.out.println("The Triangle's Color is " + triangle.getColor());
System.out.println("Is the Triangle filled? " + triangle.isFilled());
You're able to access the GeometricObject's isFilled(), setFilled(), getColor(), and setColor() because a Triangle is a GeometricObject (extends), so it inherits all its methods.
By the way, this is not how to calculate the area of a triangle:
public double getArea() {
 return (side1 + side2 + side3) / 2; // This is so wrong
}
Check out this link for correct formula
Edit: With another problem with code
public double setSide1() {
 return side1;
}
public double setSide2() {
 return side2;
}
public double setSide3() {
 return side3;
}
/**** Should Be ******/
public double getSide1() {
 return side1;
}
public double getSide2() {
 return side2;
}
public double getSide3() {
 return side3;
}
Edit: Triangle Formula
public double getArea() {
 int p = getPerimeter() / 2
 return Math.sqrt(p * ((p - side1) * (p - side2) * (p - side3));
}