- #include <stdio.h> 
- #include <math.h> 
- struct tringle { 
- 	double a; 
- 	double b; 
- 	double c; 
- }hen; 
-   
- int main(void) { 
- 	hen.a = 5; 
- 	hen.b = 5; 
- 	hen.c = 5; 
-   
- 	double q,r,s; 
- 	q = (hen.a + hen.b + hen.c) /2; 
- 	r = q* (q - hen.a) * (q- hen.b) * (q- hen.c); 
-   
- 	return 0; 
- } 
-   
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