WAP to calculate the area of a circle, rectangle, square using function

Write a program to calculate the area of a circle, rectangle, square using function

#include<stdio.h>
#define pi 3.14159

float circle(float);
float rectangle(float,float);
float square(float);

int main() {
	float r,l,b,sql;
	
	printf("Enter radius of a circle: \n");
	scanf("%f",&r);
	printf("Enter two sides of the rectangle: \n");
	scanf("%f%f",&l,&b);
	printf("Enter the length of the square: \n");
	scanf("%f",&sql);
	
	printf("The Area of a circle is %f\n",circle(r));
	printf("The Area of the rectangle is %f\n",rectangle(l,b));
	printf("The Area of Square is %f",square(sql));
	
	return 0;
}

float circle(float r) {
	return pi*r*r;
}

float rectangle(float l, float b) {
	return l*b;
}

float square(float l) {
	return l*l;
}

Output

Enter radius of circle:
2
Enter two sides of the rectangle:
3
4
Enter the length of the square:
2
The area of a circle is 12.566360
The area of the rectangle is 12.000000
The area of Square is 4.000000