#include <stdio.h> int area(int a, int b) { return a*b; } int perimeter(int a, int b) { return 2 * (a+b); } void main() { int a,b; scanf("%d %d", &a, &b); printf("Area of the rectangle: %d", area(a,b)); printf("Perimeter of the rectangle: %d", perimeter(a,b)); }#include <stdio.h> int main() { int length = 20; int breadth = 30; int area = length * breadth; printf("Area of the rectangle = %d", area); }#include<stdio.h> int main() { float length, width, area; //Input length and width of rectangle printf("You Have To Enter The Length Of The Rectangle: "); scanf("%f", &length); printf("You Have To Enter The Width Of The Rectangle: "); scanf("%f", &width); //Calculate area of rectangle area = (length * width); //Print the resultant area printf("Area of the rectangle = %.2f sq. units", area); return 0; }