Area of circle, rectangle and triangle

#include <stdio.h>

int main()
{
    int ra,l,b,ba,h,a,ca;
    
    
    printf("Enter the Number to calculate area of 1-Circle 2-Rectangle 3-Triangle \n");
    scanf("%d",&ca);
    
    switch (ca)
    {
        case 1: 
        printf("Enter the Radius of Circle\n");
        scanf("%d",&ra);
        a = ra*ra*3.14;
        printf("Area of Circle is %d",a);
        break;
    
        case 2: 
        printf("Enter the length of the rectangle\n");
        scanf("%d",&l);
        printf("Enter the breadth of the rectangle\n");
        scanf("%d",&b);
        a = l*b;
        printf("Area of Rectangle is %d",a);
        break;
    
        case 3:
        printf("Enter the Base of the triangle\n");
        scanf("%d",&ba);
        printf("Enter the height of the triangle\n");
        scanf("%d",&h);
        a = 0.5*ba*h;
        printf("Area of Triangle is %d",a);
        break;
    
    default: 
    printf("Wrong input");
    }
    
    
    
    return 0;
}