Right angled

package codechef;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class RightAngledTriangle {

    public static void main(String args[]) throws IOException {
BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
        double points[][];
        points = new double[Integer.parseInt(br.readLine())][];
        for (int i = 0; i < points.length; i++) {
            points[i] = new double[6];
            String numbers[]=br.readLine().split(" ");
            for (int j = 0; j < points[i].length; j++) {
                points[i][j] = Double.parseDouble(numbers[j]);
            }
        }

        double a, b, c;
        int counter = 0;
        for (int i = 0; i < points.length; i++) {
            a = (points[i][3] - points[i][1]) / (points[i][2] - points[i][0]);
            b = (points[i][5] - points[i][3]) / (points[i][4] - points[i][2]);
            c = (points[i][1] - points[i][5]) / (points[i][0] - points[i][4]);
            if (Double.isInfinite(a * b) || Double.isInfinite(b * c) || Double.isInfinite(a * c)) {
                counter++;
            }

        }
        System.out.println(counter);
    }
}