#include <stdio.h>
#define PI 3.14159   // Defining constant value of PI
 
int main() {
    int choice;
    float length, width, radius, area, perimeter, circumference;
 
    // Display Menu
    printf("=== Geometry Calculator ===\n");
    printf("1. Area and Perimeter of Rectangle\n");
    printf("2. Area and Circumference of Circle\n");
    printf("Enter your choice (1 or 2): ");
    scanf("%d", &choice);
 
    switch(choice) {
        case 1:
            // Rectangle calculation
            printf("\nEnter the length of the rectangle: ");
            scanf("%f", &length);
            printf("Enter the width of the rectangle: ");
            scanf("%f", &width);
 
            area = length * width;
            perimeter = 2 * (length + width);
 
            printf("\nArea of Rectangle      = %.2f\n", area);
            printf("Perimeter of Rectangle = %.2f\n", perimeter);
            break;
 
        case 2:
            // Circle calculation
            printf("\nEnter the radius of the circle: ");
            scanf("%f", &radius);
 
            area = PI * radius * radius;
            circumference = 2 * PI * radius;
 
            printf("\nArea of Circle          = %.2f\n", area);
            printf("Circumference of Circle = %.2f\n", circumference);
            break;
 
        default:
            printf("\nInvalid choice! Please select 1 or 2.\n");
    }
 
    return 0;
}