#define _CRT_SECURE_NO_WARNINGS
#include <string>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>


using namespace std;

int main(int argc, char** argv) {

	double pi = 3.14;
	double radius = 0;
	printf("Enter the radius:\r\n");
	scanf("%lf", &radius);

	double base = 0;
	printf("Triangle Base:\r\n");
	scanf("%lf", &base);

	double height = 0;
	printf("Triangle Height:\r\n");
	scanf("%lf", &height);


	double aOfCircle = pi * (radius * radius);


	double aOfTriangle = (base * height) / 2;

	printf("Area of circle once triangle removed is %0.2lf\r\n", aOfCircle - aOfTriangle);

	system("PAUSE");
}