An octagon is a polygon with eight sides. To calculate the area of octagon the following formula is used,
Area of octagon = ((a2*2) / *tan (22.5°)) = ((2*a*a)(1+√2))
Code Logic, The area of a polygon with eight side is calculated by using the above formula. The expression uses sqrt function to find the square root of 2. The value of expression is evaluated as a floating point value that is put into the float area variable.
Example
#include <stdio.h> #include <math.h> int main(){ int a = 7; float area; float multiplier = 6.18; printf("Program to find area of octagon \n"); printf("The side of the octagon is %d \n", a); area = ((2*a*a)*(1 + sqrt(2))); printf("The area of Enneagon is %f \n", area); return 0; }
Output
Program to find area of octagon The side of the octagon is 7 The area of Enneagon is 236.592926