Getting Wrong Values When Calculating Perimeter And Area?

I've been given a school assignment that reads, "Rewrite the main class Geometry so it takes in the dimensions for the triangle and ellipse as user inputs and create a Triangle and an Ellipse class. Use the appropriate variable types, constants, variable names and computational formulas.

Triangle class will have a computePerimeter and a computeArea methods Ellipse class will have a computeArea method Create Report class

• Create a method createReport that takes the values returned from Triangle and Ellipse and combines them in the following message and displays it. Format the values so that they have 2 decimals.

“The triangle has a perimeter of [perimeter] with an area of [area] while the ellipse has an area of [area]”

• Create a method switchReport that takes the original string from createReport and changes the message to display using the available methods in the String class

“The ellipse has an area of [area] while the triangle has an area of [area] with a perimeter of [perimeter]”"

I've run into a problem when creating the createReport method. Everytime i run it i get incorrect values for the perimeter and area (namely i get zero every time).

my code is as follows:

public class Triangle
{
public double base;
public double height;
public double hypotenuse;
private double tArea;
private double perimeter;
  public Triangle()
{
base = 0;
height = 0;
hypotenuse = 0;

[code]....

For the triangle class and

public class Report {
  Triangle tri2 = new Triangle();
Ellipse eli2 = new Ellipse();
  public Report() { 
} 
public void createReport() {
System.out.println("The triangle has a perimeter of "+tri2.computePerimeter() +" with an area of " +tri2.computeTArea() +" while the ellipse has an area of " +eli2.computeEArea() );
}

for the report class.the Geometry class allows you to input values and if i skip the report and simply print the perimeter and area they are correct. However with the report class it simply gives me zeros.