Compute Distance, time and height

#include<iostream.h>
#include<conio.h>
#include<math.h>

#define    G    9.8
#define    PI    3.14159265
#define    RADIANS_PER_DEGREE    (PI / 180)

void main()
{
    float velocity, theta;
    clrscr();

    cout<<"Enter velocity & theta :";
    cin>>velocity>>theta;

    /* Convert degree into Radians */
    theta *= RADIANS_PER_DEGREE;

    cout<<"\nDistance :"<<(velocity * velocity * sin(2 * theta) / G);

    cout<<"\nTime :"<<(2 * velocity * sin(theta) / G);

    cout<<"\nHeight :"<<(velocity * velocity * sin(theta) / G;
}