[UVa] 10209 - Is This Integration ?

題目網址: http://goo.gl/hfk13u

題意:
(from luckycat)


解法: 先解中間那塊，三角函數用一用就算的出來囉。

TAG: Math

注意:

程式碼:

	/**
	* Tittle: 10209 - Is This Integration ?
	* Author: Cheng-Shih, Wong
	* Date: 2015/05/19
	*/
	// include files
	#include <iostream>
	#include <cstdio>
	#include <cstring>
	#include <cmath>
	using namespace std;
	// definitions
	#define FOR(i,a,b) for( int i=(a),_n=(b); i<=_n; ++i )
	#define clr(x,v) memset( x, v, sizeof(x) )
	// declarations
	const double PI = acos(-1.0);
	double r;
	double area;
	double A, B, C;
	// functions
	// main function
	int main( void )
	{
	area = PI/3.0 - 4.0*cos(PI*75/180)*sin(PI*75/180) + 2.0 - sqrt(3.0);
	// input
	while( scanf( "%lf", &r )==1 ) {
	// solve
	A = r*r*area;
	B = r*r*(PI-2.0) - 2.0*A;
	C = r*r - A - B;
	// output
	printf( "%.3lf %.3lf %.3lf\n", A, B, C );
	}
	return 0;
	}

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