#include <cmath.h>
class Triangle{
    private:
        float a;
        float b;
        float theta;
    public:
        Triangle(float first,float second,float angle);
        void setA(float first) ;
        void setB(float second) ;
        void setTheta(float angle);
        float getA() const;
        float getB() const;
        float getTheta() const;
        float thirdSide() const;
};
Triangle::Triangle(float first,float second,float angle){
    a = first;
    b = second;
    theta = angle;
}
void Triangle::setA(float first)
{
    a = first;
}
void Triangle::setB(float second)
{
    b = second;
}
void Triangle::setTheta(float angle)
{
    angle = theta;
}
float Triangle::getA()
{
    return a;
}
float Triangle::getB()
{
    return b;
}
float Triangle::getTheta()
{
    return theta;
}
float Triangle::thirdSide() const
{
    float third;
    third = Math.sqrt(a^2 + b^2 - (2*b*a*Math.cos(theta)));
    return thrid;
}












#include <iostream>
using namespace std;
#include "triangle.h"

int main()
{
    float a,b,theta;
    a = cin<<"Enter side A:";
    b= cin<<"Enter side B: ";
    theta = cin<<"Enter angle theta: ";
    Triangle tri(10,20,30);
    cout>>"The third side is: ">>tri.getThirdside;

    return 0;
}