#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main() {
     float b,h,a;
    printf("please enter base and height; ");
    scanf("%f %f",&b,&h);
    a=1.0/2.0*b*h;
    printf("the area of triangle with base %f and height %f is %f",b,h,a);
        

    return 0;
}