public double getThirdSide()

If the triangle is not valid, this should return 0. Otherwise it should return the length of the third side of the triangle.

i cant figure out how to put this into coding any help thanks

```
public class Triangle {
//PART 1
// a triangle is defined by two sides and an angle
double side1, angle, side2;
public Triangle( double side1, double angle, double side2) {
this.side1 = side1;
this.angle = angle;
this.side2 = side2;
}
public boolean isValid() {
if ((side1 > 0 && side2 > 0) && (angle > 0 && angle <= 180)){
return true;
} else
return false;
}
public double getThirdSide(){
return 0;
}
public double getArea(){
return 0;
}
public boolean isEquilateral(){
if (side1 == side2 && side2 == angle)
System.out.println("Equilateral");
return false;
}
public boolean isIsosceles(){
if (side1 == side2 || side1 == angle || side2 == angle)
System.out.println("Isosceles");
return false;
}
public boolean isRight(){
return false;
}
public String toString() {
if(isValid() == true) {
return "The triangle with side " + side1+ ", angle " + angle +"and side" + side2+ " is valid";}
else return "The triangle with side " + side1+ ", angle " + angle +"and side" + side2+ " is invalid";
}
}
```