traingle2

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Algorithm

Step 1: Begin

Step 2: Read a, b, c

Step 3: s = (a + b + c)/2

Step 3: area = √ (s (s-a) (s-b) (s-c))

Step 4: Print area

Step 5: End

Flowchart

Program

/*calculate the area of a triangle using three sides */
#include
#include

#include /*for sqrt function*/
void main()
{
float area, a, b, c ,s;
clrscr();
printf ("enter three sides of a triangle ");
scanf ("%f%f%f",&a,&b,&c);

s = (a + b + c)/2;
area=sqrt( s * (s-a) * (s-b) * (s-c));
printf ("Area of a triangle is %f", area);
}

Illustration of the program:

Variables area is used for area of a triangle, s as parameter and a, b, c are used for three sides of triangle .

If you entered , 1.5 2 2.5 as a, b, c, s = (1.5 + 2 + 2.5)/2=3.0000,

then area = √( 3 * (3 - 1.5) * (3 - 2) * (3 - 2.5))

= √ 2.25

= 1.5

So, the output is

Area of a triangle is 1.5

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