#include <iostream>
 
int main() {
    // 밑변과 높이를 저장할 변수 선언
    double base, height;
 
    // 사용자로부터 삼각형의 밑변을 입력받음
    std::cout << "밑변은 3.5";
    std::cin >> base; // 밑변 입력
 
    // 사용자로부터 삼각형의 높이를 입력받음
    std::cout << "높이는 7.5";
    std::cin >> height; // 높이 입력
 
    // 삼각형의 넓이 계산
    double area = (3.5 * 7.5) / 2;
 
    // 결과 출력
    std::cout << "삼각형의 넓이는 " << area << "입니다." << std::endl;
 
    return 0;
}
 

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