Help me in solving CLB026 problem

My issue

how to represent radius square

My code

#include <stdio.h>

int main(void) {
	float radius=8.9,pi=3.14;
	float area=(radius*radius)*pi;
	printf("The Area of the given circle is %f",area);// your code goes here
	return 0;

Learning course: Learn C
Problem Link: CodeChef: Practical coding for everyone

whats the issue??
since radius is 8.9 which is a floating values its data type will be float .