{"post":"

Understanding the problem

We have to write a program that accepts three sides of a triangle from the user and prints its area. To calculate the area of a triangle from the three given sides, we use Heron’s Formula:

Area = √ s*(s-a)*(s-b)*(s-c),

where s = (a+b+c)/2

Algorithm

Take input of the three sides of the triangle from the user and store them in the variables a, b and c.
Now declare a variable of float type and calculate and store the half perimeter in it. (don’t forget to use explicit typecasting since ‘s’ is of float type and a, b, c are int)
Declare a variable area of float type and calculate and store area of the triangle in it using s and the given formula.
Print area.

Code:

#include <iostream>\n#include<cmath> //to use sqrt function\nusing namespace std;\nint main()\n{\nint a,b,c; //taking input of the three sides from the user
\n    cout << \"Enter the three sides of the triangle\\n\";
\n    cin>>a>>b>>c;
\n    float s=(float)(a+b+c)/2; //calculating s
\n    float area=sqrt(s*(s-a)(s-b)(s-c)); //calculating area
\n    cout<<\"Area=\"<<area; //printing the area
\n    return 0;
\n}

Output:

Enter the three sides of the triangle:\n5 10 12\nArea = 24.5446

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