求四边形的面积，当给定对角线和相对顶点的垂线时

给定三个整数d 、 h1 、 h2 ，其中d表示四边形对角线的长度。 h1和h2表示从相对顶点到给定对角线的垂线的长度。任务是找到四边形的面积。

例子：

Input : d= 6, h1 = 4, h2 = 3 
Output : 21
Input : d= 10, h1 = 8, h2 = 10 
Output : 90 
 

方法 ：
四边形的面积是两个三角形的面积之和。我们知道三角形的面积是1/2*底*高。
因此，四边形的面积可以计算为：

Area = 1/2 * d * h1 + 1/2 * d * h2 
= 1/2 * d * ( h1 + h2 ) 
 

下面是上述方法的实现：

C++

// C++ program to find the area of quadrilateral
#include 
using namespace std;
 
// Function to find the area of quadrilateral
float Area(int d, int h1, int h2)
{
    float area;
 
    area = 0.5 * d * (h1 + h2);
 
    return area;
}
 
// Driver code
int main()
{
    int d = 6, h1 = 4, h2 = 3;
 
    cout << "Area of Quadrilateral = " << (Area(d, h1, h2));
 
    return 0;
}

Java

// Java program to find the area of quadrilateral
class GFG
{
 
    // Function to find the area of quadrilateral
    static float Area(int d, int h1, int h2)
    {
        float area;
 
        area = (float) 0.5 * d * (h1 + h2);
 
        return area;
    }
 
    // Driver code
    public static void main(String[] args)
    {
        int d = 6, h1 = 4, h2 = 3;
 
        System.out.println("Area of Quadrilateral = " +
                                      Area(d, h1, h2));
    }
}
 
// This code is contributed by Princi Singh

Python3

# Python3 program to find
# the area of quadrilateral
 
# Function to find the
# area of quadrilateral
def Area(d, h1, h2):
 
    area = 0.5 * d * (h1 + h2);
 
    return area;
 
# Driver code
if __name__ == '__main__':
     
    d = 6;
    h1 = 4;
    h2 = 3;
 
    print("Area of Quadrilateral = ",
                  (Area(d, h1, h2)));
 
# This code is contributed by Rajput-Ji

C#

// C# program to find the area of quadrilateral
using System;
 
class GFG
{
     
// Function to find the area of quadrilateral
static float Area(int d, int h1, int h2)
{
    float area;
 
    area = (float)0.5 * d * (h1 + h2);
 
    return area;
}
 
 
// Driver code
public static void Main()
{
    int d = 6, h1 = 4, h2 = 3;
     
    Console.WriteLine("Area of Quadrilateral = " +
                                 Area(d, h1, h2));
}
}
 
// This code is contributed by nidhiva

Javascript

 
// JavaScript program to find the area of quadrilateral
 
// Function to find the area of quadrilateral
function Area(d, h1, h2)
{
    let area;
 
    area = 0.5 * d * (h1 + h2);
 
    return area;
}
 
// Driver code
 
    let d = 6, h1 = 4, h2 = 3;
 
    document.write("Area of Quadrilateral = " + (Area(d, h1, h2)));
 
 
// This code is contributed by Surbhi Tyagi.
 

输出：

Area of Quadrilateral = 21

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