WAP with classes to represent circle, rectangle and triangle. Each classes should have data members to represent the actual objects and member functions to read and display objects , find perimeter and area of the object with other useful functions. Use the classes to create objects in your program.

#include

#include

#include

#define PI 3.14159

class circle

{

      private:

      float r,a1,p1;

      public:

      void get()

      {

                  cout<

                  cin>>r;

      }

      void show()

      {

                  cout<

                  cout<

      }

      friend float a(float r);

      friend float b(float r);

};

class rectangle

{

      private:

      float l,b;

      public:

      void get()

      {

                  cout<

                  cin>>l>>b;

      }

      void show()

      {

                  cout<

                  cout<

      }

      friend float c(float l,float b);

      friend float d(float l,float b);

};

class triangle

{

      private:

      float s,s1,s2,s3,a3,p3;

      public:

      void get()

      {

                  cout<

                  cin>>s1>>s2>>s3;

      }

      void show()

      {

                  cout<

                  cout<

      }

      friend float e(float s,float s1,float s2,float s3);

      friend float f(float s,float s1,float s2,float s3);

};

float a(float r)

{

      return (PI*r*r);

}

float b(float r)

{

      return (2*PI*r);

}

float c(float l,float b)

{

      return (l*b);

}

float d(float l,float b)

{

      return (2*(l+b));

}

float e(float s,float s1,float s2,float s3)

{

      s=(s1+s2+s3)/2;

      return (pow((s-s1)*(s-s2)*(s-s3),1/2));

}

float f(float s,float s1,float s2,float s3)

{

      return (s1+s2+s3);

}

void main()

{

      clrscr();

      circle c;

      c.get();

      c.show();

      rectangle r;

      r.get();

      r.show();

      triangle t;

      t.get();

      t.show();

      getch();

}