C program to find area and perimeter of equilateral triangle

C Program to find area and perimeter of equilateral triangle:

By Ahmad Irshad | Programming Exercises and Solutions > find area & perimeter of equilateral triangle.

Write a C program to find area and perimeter of equilateral triangle if it's sides are given. 

Before writing any program you just imagine about output screen first. Like what input to be given, and output to be displayed. Let's have a look at the below example.

1. INPUT
2. 
   
3. Enter side of an equilateral triangle = 15
   

  OUTPUT

Enter side of an equilateral triangle = 97.43 sq.units

Perimeter of an equilateral triangle = 43.3 units

Required knowledge for this exercise is: 

Basic Input output, Data Type, Arithmetic operators 

Area & perimeter of equilateral triangle if it's sides are given:

Use farmula to find perimeter of an equilateral triangle, P = 3 * Side 

Where S = Side, A = Area, and P = Peremeter.

Logic to find area and perimeter of equilateral triangle if sides are given:

Step by step logic to find area and perimetre of equilateral triangle.

1) Print a massage to the user like "Enter side of an equilateral triangle:" using printf();

2) Input side of an equilateral triangle from user and store it in a variable side using scanf();

3) Now find area and perimeter of equilateral triangle using below farmula

area = sqrt(3) / 4 (side * side); and perimeter = 3 * side;

4) At last print the value of area and perimeter. that's it!

Program to find area & perimeter of an equilateral triangle if sides are given: 

1. /* C program to find area of equilateral triangle if it's sides are given */
   
2. #include <stdio.h> #include <math.h> // Used for sqrt() function int main() { float side, area, perimeter; /* Input side of equilateral triangle from user */ printf("Enter side of an equilateral triangle: "); scanf("%f", &side); /* Calculate area & perimeter of an equilateral triangle */ area = (sqrt(3) / 4) * (side * side); perimeter = 3 * side
3. /* Print the value of area & perimeter */ printf("Area of equilateral triangle = %.2f sq. units", area); printf("Perimeter of equilateral triangle = %.2f units", perimeter); return 0; }

%.2f is used to print real values only up to 2 decimal places. You can also use %f to print up to 6 decimal places by default.

sqrt() is a function which is used to find square root of a given number.

Output:

1. Enter side  of an equilateral triangle = 15
2. Area of equilateral triangle = 97.43 sq. units
3. Perimeter of  equilateral triangle = 45 units

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