Help me in solving PPSC16 problem

help
,
1

My issue

why my answer is wrong?

My code

#include <stdio.h>

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

Learning course: CSEIPFOIA: Programming and Problem Solving
Problem Link: Double datatype Practice Problem in CSEIPFOIA: Programming and Problem Solving - CodeChef