In this article, we are going to learn about how to find the area of a triangle and rectangle. We will learn both these shapes area calculations using the C language program.

- How to calculate area of Traingle in C language.
- How to calculate area of Rectangle in C language.

### How to calculate area of Triangle in C language

In this example, we are going to learn the area of triangle calculation using C. We will learn this with the help of multiple formulas. First, we will use a simple formula for the area of a triangle, which is

Formula

```
Area=(1/2) * base * height
```

Second, we will learn it using another formula, which is and,

```
s=(a+b+c)/2
Area=sqrt(s(s-a)(s-b)*(s-c))1/2
```

where a,b,c are the sides length of the triangle.s is the half of the perimeter of the triangle.

### C Program to find Area of Right angle triangle

so let us begin with our code example.

```
#include<stdio.h>
int main()
{
float b, h, area;
printf("Please enter the base and height of Traingle: ");
scanf("%f %f", &b, &h);
area = (0.5 * b * h);
printf("The Area of Triangle is = %.2f\n", area );
return 0;
}
```

Output

```
Please enter the base and height of Traingle: 12 13
The Area of Triangle is = 78.00
```

### C Program to find Area of any triangle with sides a,b,c

```
#include<stdio.h>
#include<math.h>
int main()
{
float a, b, c, s, area;
printf("Please enter the sides length of Traingle: ");
scanf("%f %f %f",&a,&b,&c);
s = (a+b+c)/2;
area = sqrt( s*(s-a)*(s-b)*(s-c) );
printf("The Area of Triangle is = %.2f\n", area );
return 0;
}
```

Output

```
Please enter the sides length of Traingle: 12 10
15
The Area of Triangle is = 59.81
```

### How to calculate area of Rectangle in C language

In this example, we are going to calculate the area of a rectangle. To calculate the area we need the length and breadth of the rectangle.Using these sides length we can use the formula to calculate the area as:

```
Area = length * width
```

Let us see this with code example below.

```
#include<stdio.h>
int main()
{
float length, width, Area;
printf("Please enter the length & width of Rectangle: ");
scanf("%f %f",&length,&width);
Area = length * width;
printf("The Area of Rectangle is = %.3f \n",Area);
return 0;
}
```

output

```
Please enter the length & width of Rectangle: 12 13
The Area of Rectangle is = 156.000
```