C :

#include<stdio.h>
int main()
{
	printf("s=400.00");
}

C++ :

#include<cstdio>
using namespace std; 
int main()
{ 
	float ss,sh,sup,sdown;
	sup=15;
	sdown=25;
	sh=2*150/sup;
	ss=(sup+sdown)*sh/2;
	printf("s=%0.2f\n",ss);
	return 0; 
}

Python :

# coding=utf-8

def main():
    h = 150 * 2 / 15

    s = (15 + 25) * h / 2
    zs = format(float(s), '.2f')
    print('s='+zs)


if __name__ == '__main__':
    main()