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The sine Rule

JEvans1234 (17)
I am basically trying to make a program for a calculator. I am struggling with how to do the sine calculation. this calculation will take place at line 158. Any help will be highly appreciated. Thanks

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#include <iostream>
#include <cmath>

using namespace std;

int main()

{

         double firstNumber = 0.0;
         double secondNumber = 0.0;
         char operation =' ';

do
{
     cout << "welcome to Calculator++." << endl;
     cout << " " << endl;
     cout << "Select Operation" << endl;
     cout << "1. Standard calculator operations" << endl;
     cout << "2. Trigonometry" << endl;
     cout << "3. Statistics" << endl;

    int M;
    cin >> M;

     if ( M == 1 ){
        cout << " " << endl;
        cout << "1. Addition" << endl;
        cout << "2. Subtraction" << endl;
        cout << "3. Multiplication" << endl;
        cout << "4. Division" << endl;
        cout << "5. Square a number" << endl;
        cout << "6. Cube a number" << endl;
        cout << "7. Exponent's ( X^n)" << endl;
        cout << "8. Squareroot" << endl;
        cout << "9. Cuberoot" << endl;
        cout << "10. Log [log10(x)]" << endl;
        cout << "11. Finding the length of a hypotenuse" << endl;

     }

        {
            int Op;

                cout << " " << endl;
                cout << "Enter first Number" << endl;
                cin>>firstNumber;
                cout << " " << endl;
                cout << "Enter Operation number (1 to 11)" << endl;
                cin>>Op;
                cout << " " << endl;
                cout << "Enter second Number (enter zero for operation 5, 6, 8, 9 & 10)" << endl;
                cin>>secondNumber;
                cout << " " << endl;

                if ( Op == 1){
                    cout << "the answer is..."<<firstNumber<<"+"<<secondNumber<<"="<<(firstNumber+secondNumber) << endl;
                }
                if ( Op == 2){
                    cout << "the answer is..."<<firstNumber<<"-"<<secondNumber<<"="<<(firstNumber-secondNumber) << endl;
                }
                if ( Op == 3){
                    cout << "the answer is..."<<firstNumber<<"*"<<secondNumber<<"="<<(firstNumber*secondNumber) << endl;
                }
                if ( Op == 4){
                    cout << "the answer is..."<<firstNumber<<"/"<<secondNumber<<"="<<(firstNumber/secondNumber) << endl;
                }
                if ( Op == 5){
                    cout << "the answer is..."<<firstNumber<<"*"<<firstNumber<<"="<<(firstNumber*firstNumber) << endl;
                }
                if ( Op == 6){
                    cout << "the answer is..."<<firstNumber<<"*"<<firstNumber<<"*"<<firstNumber<<"="<<(firstNumber*firstNumber*firstNumber) << endl;
                }
                if ( Op == 7){
                    cout << "the answer is..."<<std::pow(firstNumber, secondNumber) << endl;
                    break;
                }
                if ( Op == 8){
                    cout << "the answer is..."<<std::sqrt(firstNumber) << endl;
                    break;
                }
                if ( Op == 9){
                    cout << "the answer is..."<<std::cbrt(firstNumber) << endl;
                    break;
                }
                if ( Op == 10){
                    cout << "the answer is..."<<std::log10(firstNumber) << endl;
                    break;
                }
                if ( Op == 11){
                    cout << "the answer is..."<<std::hypot(firstNumber,secondNumber) << endl;
                    break;
                }
        return 0;
        }

     if ( M == 2 ){
        cout << "1. Cos(angle)" << endl;
        cout << "2. Sin(angle)" << endl;
        cout << "3. Tan(angle)" << endl;
        cout << "4. Sine (find an angle)" << endl;
        cout << "5. Sine (find a length)" << endl;
        cout << "6. Cosine (find an angle)" << endl;
        cout << "7. Cosine (find a length)" << endl;
        cout << "8. Degrees to Raidians" << endl;
        cout << "9. Radians to Degrees" << endl;
        cout << "10. Arc Length" << endl;
        cout << "11. Area of a Sector" << endl;
        cout << "12. Area of a segment in a circle" << endl;
     }
     {
         int Op1;
         int angle;
         int angleA;
         int angleB;
         int angleC;
         int lengthA;
         int lengthB;
         int lengthC;


            cout << " " << endl;
            cout << "Enter Operation number (1 to 12)" << endl;
            cin>>Op1;
            cout << " " << endl;

            if ( Op1 == 1){
                cout << "Enter angle" << endl;
                cin>>angle;
                cout << " " << endl;
                cout << "the answer is..." <<std::cos(angle) << endl;
                break;
            }
            if ( Op1 == 2){
                cout << "Enter angle" << endl;
                cin>>angle;
                cout << " " << endl;
                cout << "the answer is..." <<std::sin(angle) << endl;
                break;
            }
            if ( Op1 == 3){
                cout << "Enter angle" << endl;
                cin>>angle;
                cout << " " << endl;
                cout << "the answer is..." <<std::tan(angle) << endl;
                break;
            }
            if ( Op1 == 4){
                cout << "Enter angle A" << endl;
                cin>>angleA;
                cout << " " << endl;
                cout << "Enter length A" << endl;
                cin>>lengthA;
                cout << " " << endl;
                cout << "Enter length B" << endl;
                cin>>lengthB;
                cout << " " << endl;
                cout << "the answer is..." <<



            }



     }

     if ( M == 3 ){
        cout << "1. " << endl; //*

        cout << "2. " << endl;
        cout << "3. " << endl;
        cout << "4. " << endl;
        cout << "5. " << endl;
        cout << "6. " << endl;
        cout << "7. " << endl;

        return 0;
     }
} while (true);

}
kbw (9488)
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