```cpp

include[HTML_REMOVED]

using namespace std;
int main(){
double A,B,C,s1,s2,s3,s4,s5;
scanf(“%lf %lf %lf”,&A,&B,&C);
s1=0.5AC;
s2=3.14159CC;
s3=0.5(A+B)C;//二分之一不一定能编译成功，用小数就可以了
s4=BB;
s5=AB;
printf(“TRIANGULO: %.3lf\nCIRCULO: %.3lf\nTRAPEZIO: %.3lf\nQUADRADO: %.3lf\nRETANGULO: %.3lf\n”,s1,s2,s3,s4,s5);
return 0;
}